opacification | (noun) the process of becoming cloudy or opaque | - |
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opacify | (verb) become opaque | - |
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(verb) make opaque | - |
opacity | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opaqueness |
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(noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opaqueness |
(noun) the phenomenon of not permitting the passage of electromagnetic radiation | - |
opah | (noun) large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean | Synonyms: Lampris regius, moonfish |
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opal | (noun) a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones | - |
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opalesce | (verb) exhibit a play of colors like that of an opal | - |
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(verb) reflect light or colors like an opal | - |
opalescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: iridescence |
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opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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opalise | (verb) replace or convert into opal | Synonyms: opalize |
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(verb) make opalescent | Synonyms: opalize |
opalize | (verb) replace or convert into opal | Synonyms: opalise |
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(verb) make opalescent | Synonyms: opalise |
opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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(adjective) hard or impossible to understand | Synonyms: unintelligible |
opaquely | (adverb) in an opaque manner | - |
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opaqueness | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opacity |
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(noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opacity |
open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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(adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
(adjective) affording free passage or access | - |
(adjective) (set theory) of an interval that contains neither of its endpoints | - |
(adjective) open and observable; not secret or hidden | Synonyms: overt |
(adjective) used of mouth or eyes | Synonyms: opened |
(adjective) ready for business | - |
(adjective) not having been filled | - |
(adjective) (of textures) full of small openings or gaps | Synonyms: loose |
(adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
(adjective) not requiring union membership | - |
(adjective) open to or in view of all | - |
(adjective) possibly accepting or permitting | Synonyms: capable, subject |
(adjective) without undue constriction as from e.g. tenseness or inhibition | - |
(adjective) having no protecting cover or enclosure | - |
(adjective) affording free passage or view | Synonyms: clear |
(adjective) with no protection or shield | Synonyms: exposed |
(adjective) accessible to all | - |
(adjective) not sealed or having been unsealed | Synonyms: opened |
(adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
(adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
(noun) information that has become public | Synonyms: surface |
(noun) a tournament in which both professionals and amateurs may play | - |
(noun) a clear or unobstructed space or expanse of land or water | Synonyms: clear |
(noun) where the air is unconfined | Synonyms: open air, out-of-doors, outdoors |
(verb) make available | Synonyms: open up |
(verb) become available | Synonyms: open up |
(verb) make the opening move | - |
(verb) cause to open or to become open | Synonyms: open up |
(verb) become open | Synonyms: open up |
(verb) spread out or open from a closed or folded state | Synonyms: spread, spread out, unfold |
(verb) display the contents of a file or start an application as on a computer | - |
(verb) afford access to | Synonyms: afford, give |
(verb) start to operate or function or cause to start operating or functioning | Synonyms: open up |
(verb) begin or set in action, of meetings, speeches, recitals, etc. | - |
(verb) have an opening or passage or outlet | - |
openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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opened | (adjective) used of mouth or eyes | Synonyms: open |
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(adjective) made open or clear | - |
(adjective) not sealed or having been unsealed | Synonyms: open |
opener | (noun) a hand tool used for opening sealed containers (bottles or cans) | - |
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(noun) the first event in a series | - |
(noun) a person who unfastens or unwraps or opens | Synonyms: undoer, unfastener, untier |
openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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openhandedness | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, largesse, magnanimity, munificence |
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openhearted | (adjective) freely communicative; candidly straightforward | - |
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(adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
opening | (adjective) first or beginning | - |
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(noun) a recognized sequence of moves at the beginning of a game of chess | Synonyms: chess opening |
(noun) the act of opening something | - |
(noun) becoming open or being made open | - |
(noun) the first of a series of actions | Synonyms: first step, initiative, opening move |
(noun) a vacant or unobstructed space that is man-made | - |
(noun) an entrance equipped with a hatch; especially a passageway between decks of a ship | Synonyms: hatchway, scuttle |
(noun) an aperture or hole that opens into a bodily cavity | Synonyms: orifice, porta |
(noun) a possible alternative | Synonyms: possibility, possible action |
(noun) the initial part of the introduction | - |
(noun) the first performance (as of a theatrical production) | Synonyms: curtain raising, opening night |
(noun) a ceremony accompanying the start of some enterprise | - |
(noun) an open or empty space in or between things | Synonyms: gap |
(noun) opportunity especially for employment or promotion | - |
openly | (adverb) in an open way | - |
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openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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openness | (noun) characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive | Synonyms: nakedness |
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(noun) willingness or readiness to receive (especially impressions or ideas) | Synonyms: receptiveness, receptivity |
(noun) without obstructions to passage or view | - |
openwork | (noun) ornamental work (such as embroidery or latticework) having a pattern of openings | - |
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opepe | (noun) large African forest tree yielding a strong hard yellow to golden brown lumber; sometimes placed in genus Sarcocephalus | Synonyms: Nauclea diderrichii, Sarcocephalus diderrichii |
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opera | (noun) a building where musical dramas are performed | Synonyms: opera house |
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(noun) a drama set to music; consists of singing with orchestral accompaniment and an orchestral overture and interludes | - |
operable | (adjective) capable of being treated by surgical operation | - |
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(adjective) usable for a specific purpose | Synonyms: practicable |
(adjective) fit or ready for use or service | Synonyms: functional, operational, usable, useable |
operagoer | (noun) a patron of the opera | - |
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operand | (noun) a quantity upon which a mathematical operation is performed | - |
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operant | (adjective) having influence or producing an effect | - |
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operate | (verb) perform surgery on | Synonyms: operate on |
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(verb) perform a movement in military or naval tactics in order to secure an advantage in attack or defense | Synonyms: maneuver, manoeuver, manoeuvre |
(verb) handle and cause to function | Synonyms: control |
(verb) keep engaged | Synonyms: engage, lock, mesh |
(verb) perform as expected when applied | Synonyms: function, go, run, work |
(verb) direct or control; projects, businesses, etc. | Synonyms: run |
operatic | (adjective) of or relating to or characteristic of opera | - |
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operating | (adjective) involved in a kind of operation | - |
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(adjective) being in effect or operation | Synonyms: in operation, operational |
operation | (noun) a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body | Synonyms: surgery, surgical operation, surgical procedure, surgical process |
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(noun) (mathematics) calculation by mathematical methods | Synonyms: mathematical operation, mathematical process |
(noun) activity by a military or naval force (as a maneuver or campaign) | Synonyms: military operation |
(noun) a planned activity involving many people performing various actions | - |
(noun) a process or series of acts especially of a practical or mechanical nature involved in a particular form of work | Synonyms: procedure |
(noun) a business especially one run on a large scale | - |
(noun) the activity of operating something (a machine or business etc.) | - |
(noun) (psychology) the performance of some composite cognitive activity; an operation that affects mental contents | Synonyms: cognitive operation, cognitive process, mental process, process |
(noun) (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) | - |
(noun) process or manner of functioning or operating | Synonyms: functioning, performance |
(noun) the state of being in effect or being operative | - |
operational | (adjective) (military) of or intended for or involved in military operations | - |
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(adjective) pertaining to a process or series of actions for achieving a result | - |
(adjective) being in effect or operation | Synonyms: in operation, operating |
(adjective) fit or ready for use or service | Synonyms: functional, operable, usable, useable |
operationalism | (noun) (philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it | - |
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operationalist | (adjective) of or relating to or espousing operationalism | - |
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operationally | (adverb) in respect to operation | - |
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operations | (noun) financial transactions at a brokerage; having to do with the execution of trades and keeping customer records | Synonyms: trading operations |
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operative | (adjective) being in force or having or exerting force | - |
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(adjective) relating to or requiring or amenable to treatment by surgery especially as opposed to medicine | Synonyms: surgical |
(adjective) (of e.g. a machine) performing or capable of performing | Synonyms: functional, running, working |
(adjective) effective; producing a desired effect | - |
(noun) someone who can be employed as a detective to collect information and assist in criminal investigations | Synonyms: PI, private detective, private eye, private investigator, shamus, sherlock |
(noun) a person secretly employed in espionage for a government | Synonyms: intelligence agent, intelligence officer, secret agent |
operatively | (adverb) in a manner to produce an effect | - |
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operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
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(noun) someone who owns or operates a business | - |
(noun) a shrewd or unscrupulous person who knows how to circumvent difficulties | Synonyms: hustler, wheeler dealer |
(noun) a speculator who trades aggressively on stock or commodity markets | - |
(noun) (mathematics) a symbol or function representing a mathematical operation | - |
operculate | (adjective) having an operculum | Synonyms: operculated |
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operculated | (adjective) having an operculum | Synonyms: operculate |
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operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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operetta | (noun) a short amusing opera | Synonyms: light opera |
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operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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operose | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome |
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operoseness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, toilsomeness |
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ophidian | (noun) limbless scaly elongate reptile; some are venomous | Synonyms: serpent, snake |
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ophidism | (noun) poisoning by snake venom | - |
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ophiolatry | (noun) the worship of snakes | Synonyms: serpent-worship |
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ophryon | (noun) the craniometric point in the midline of the forehead immediately above the orbits | - |
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ophthalmectomy | (noun) surgical removal of an eye | - |
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ophthalmia | (noun) severe conjunctivitis | Synonyms: ophthalmitis |
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ophthalmic | (adjective) of or relating to ophthalmology | - |
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(adjective) of or relating to or resembling the eye | Synonyms: ocular, optic, optical |
ophthalmitis | (noun) severe conjunctivitis | Synonyms: ophthalmia |
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ophthalmologist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, oculist |
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ophthalmology | (noun) the branch of medicine concerned with the eye and its diseases | - |
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ophthalmoplegia | (noun) paralysis of the motor nerves of the eye | - |
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ophthalmoscope | (noun) medical instrument for examining the retina of the eye | - |
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ophthalmoscopy | (noun) examination of the interior of an eye using an ophthalmoscope | - |
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opiate | (noun) a narcotic drug that contains opium or an opium derivative | - |
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opine | (verb) expect, believe, or suppose | Synonyms: guess, imagine, reckon, suppose, think |
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(verb) express one's opinion openly and without fear or hesitation | Synonyms: animadvert, sound off, speak out, speak up |
opinion | (noun) the reason for a court's judgment (as opposed to the decision itself) | Synonyms: ruling |
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(noun) a personal belief or judgment that is not founded on proof or certainty | Synonyms: persuasion, sentiment, thought, view |
(noun) a belief or sentiment shared by most people; the voice of the people | Synonyms: popular opinion, public opinion, vox populi |
(noun) a vague idea in which some confidence is placed | Synonyms: belief, feeling, impression, notion |
(noun) the legal document stating the reasons for a judicial decision | Synonyms: judgement, judgment, legal opinion |
(noun) a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof | Synonyms: view |
opinionated | (adjective) obstinate in your opinions | Synonyms: opinionative, self-opinionated |
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opinionative | (adjective) obstinate in your opinions | Synonyms: opinionated, self-opinionated |
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opisthognathous | (adjective) having receding jaws | - |
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opisthorchiasis | (noun) infestation with flukes obtained from eating raw fish; common in eastern Asia | - |
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opisthotonos | (noun) severe spasm in which the back arches and the head bends back and heels flex toward the back | - |
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opium | (noun) an addictive narcotic extracted from seed capsules of the opium poppy | - |
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opopanax | (noun) an odorous gum resin formerly used in medicines | - |
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opossum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: possum |
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(noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: phalanger, possum |
oppa | (noun) a male who is older than the speaker, especially used by Korean female | - |
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opponent | (adjective) characterized by active hostility | Synonyms: opposing |
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(noun) someone who offers opposition | Synonyms: adversary, antagonist, opposer, resister |
(noun) a contestant that you are matched against | Synonyms: opposite, opposition |
opportune | (adjective) suitable or at a time that is suitable or advantageous especially for a particular purpose | - |
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opportunely | (adverb) conveniently | - |
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opportuneness | (noun) timely convenience | Synonyms: patness, timeliness |
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opportunism | (noun) taking advantage of opportunities without regard for the consequences for others | Synonyms: expedience, self-interest, self-seeking |
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opportunist | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunistic, timeserving |
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(noun) a person who places expediency above principle | Synonyms: self-seeker |
opportunistic | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunist, timeserving |
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opportunity | (noun) a possibility due to a favorable combination of circumstances | Synonyms: chance |
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opposable | (adjective) capable of being placed opposite to something | Synonyms: apposable |
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oppose | (verb) be resistant to | Synonyms: contradict, controvert |
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(verb) be against; express opposition to | - |
(verb) set into opposition or rivalry | Synonyms: match, pit, play off |
(verb) fight against or resist strongly | Synonyms: defend, fight, fight back, fight down |
(verb) act against or in opposition to | Synonyms: react |
(verb) contrast with equal weight or force | Synonyms: counterbalance |
opposed | (adjective) being in opposition or having an opponent | - |
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opposer | (noun) someone who offers opposition | Synonyms: adversary, antagonist, opponent, resister |
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opposing | (adjective) characterized by active hostility | Synonyms: opponent |
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opposite | (adjective) of leaves etc; growing in pairs on either side of a stem | Synonyms: paired |
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(adjective) characterized by opposite extremes; completely opposed | Synonyms: diametric, diametrical, polar |
(adjective) the other one of a complementary pair | - |
(adjective) being directly across from each other; facing | - |
(adjective) altogether different in nature or quality or significance | - |
(adjective) moving or facing away from each other | - |
(noun) a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other | Synonyms: antonym, opposite word |
(noun) a contestant that you are matched against | Synonyms: opponent, opposition |
(noun) a relation of direct opposition | Synonyms: contrary, reverse |
(noun) something inverted in sequence or character or effect | Synonyms: inverse |
(adverb) directly facing each other | Synonyms: face-to-face, face to face |
oppositely | (adverb) in an opposite position | - |
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oppositeness | (noun) the relation between opposed entities | Synonyms: opposition |
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opposition | (noun) the act of hostile groups opposing each other | Synonyms: confrontation |
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(noun) the action of opposing something that you disapprove or disagree with | Synonyms: resistance |
(noun) a body of people united in opposing something | - |
(noun) an armed adversary (especially a member of an opposing military force) | Synonyms: enemy, foe, foeman |
(noun) a contestant that you are matched against | Synonyms: opponent, opposite |
(noun) a direction opposite to another | - |
(noun) the relation between opposed entities | Synonyms: oppositeness |
oppositionality | (noun) The quality of opposing or of being in conflict. | - |
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oppositive | (adjective) expressing antithesis or opposition | Synonyms: adversative |
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oppress | (verb) come down on or keep down by unjust use of one's authority | Synonyms: crush, suppress |
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(verb) cause to suffer | Synonyms: persecute |
oppressed | (adjective) burdened psychologically or mentally | Synonyms: laden |
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oppression | (noun) the act of subjugating by cruelty | Synonyms: subjugation |
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(noun) a feeling of being oppressed | Synonyms: oppressiveness |
(noun) the state of being kept down by unjust use of force or authority: | - |