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4825 Words That Start With A

Part of Speech:
Word Definitions Synonyms
actinium (noun) a radioactive element of the actinide series; found in uranium ores Synonyms: Ac, atomic number 89
actinoid (adjective) having a radial form
(noun) any of a series of radioactive elements with atomic numbers 89 through 103 Synonyms: actinide, actinon
actinolite (noun) a green mineral of the amphibole group; calcium magnesium iron silicate
actinometer (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
actinometric (adjective) of or related to actinometry Synonyms: actinometrical
actinometrical (adjective) of or related to actinometry Synonyms: actinometric
actinometry (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays)
actinomorphic (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis Synonyms: actinomorphous
actinomorphous (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis Synonyms: actinomorphic
actinomyces (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites
actinomycetal (adjective) of or belonging to the actinomycetes Synonyms: actinomycetous
actinomycete (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales
actinomycetous (adjective) of or belonging to the actinomycetes Synonyms: actinomycetal
actinomycin (noun) any of various red antibiotics isolated from soil bacteria
actinomycosis (noun) disease of cattle that can be transmitted to humans; results from infection with actinomycetes; characterized by hard swellings that exude pus through long sinuses
actinomycotic (adjective) of or related to actinomycosis infection
actinomyxidian (noun) of or relating to parasites of worms
actinon (noun) any of a series of radioactive elements with atomic numbers 89 through 103 Synonyms: actinide, actinoid
actinopod (noun) protozoa having stiff rodlike radiating pseudopods
actinotherapy (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance Synonyms: irradiation, radiation, radiation therapy, radiotherapy
actinozoan (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed Synonyms: anthozoan
action (noun) the most important or interesting work or activity in a specific area or field
(noun) a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong Synonyms: action at law, legal action
(noun) something done (usually as opposed to something said)
(noun) a military engagement Synonyms: military action
(noun) an act by a government body or supranational organization
(noun) the operating part that transmits power to a mechanism Synonyms: action mechanism
(noun) In firearms terminology, the mechanism that handles the ammunition (loads, locks, fires, and extracts the cartridges).
(noun) the trait of being active and energetic and forceful
(noun) the series of events that form a plot
(noun) a process existing in or produced by nature (rather than by the intent of human beings) Synonyms: activity, natural action, natural process
(noun) the state of being active Synonyms: activeness, activity
(verb) put in effect Synonyms: accomplish, carry out, carry through, execute, fulfil, fulfill
(verb) institute legal proceedings against; file a suit against Synonyms: litigate, process, sue
actionable (adjective) affording grounds for legal action
activate (verb) make active or more active
(verb) make (substances) radioactive
(verb) aerate (sewage) so as to favor the growth of organisms that decompose organic matter Synonyms: aerate
(verb) make more adsorptive
(verb) put in motion or move to act Synonyms: actuate, set off, spark, spark off, touch off, trigger, trigger off, trip
activated (adjective) rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive
(adjective) (military) set up and placed on active assignment
(adjective) (of e.g. a molecule) made reactive or more reactive Synonyms: excited
(adjective) (of sewage) treated with aeration and bacteria to aid decomposition
activating (adjective) causing motion or action or change Synonyms: actuating
(noun) the activity of causing to have energy and be active Synonyms: activation, energizing
activation (noun) the activity of causing to have energy and be active Synonyms: activating, energizing
(noun) making active and effective (as a bomb)
(noun) stimulation of activity in an organism or chemical
activator (noun) (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription
active (adjective) (used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being Synonyms: dynamic
(adjective) characterized by energetic activity
(adjective) tending to become more severe or wider in scope
(adjective) disposed to take action or effectuate change
(adjective) (of e.g. volcanoes) erupting or liable to erupt
(adjective) (of e.g. volcanoes) capable of erupting
(adjective) full of activity or engaged in continuous activity
(adjective) exerting influence or producing a change or effect
(adjective) engaged in full-time work
(adjective) expressing that the subject of the sentence has the semantic function of actor:
(adjective) (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions
(adjective) in operation Synonyms: alive
(adjective) taking part in an activity Synonyms: participating
(adjective) engaged in or ready for military or naval operations Synonyms: combat-ready, fighting
(noun) a person who is a participating member of an organization
(noun) the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb Synonyms: active voice
(noun) chemical agent capable of activity Synonyms: active agent
actively (adverb) in an active manner
activeness (noun) the trait of being active; moving or acting rapidly and energetically Synonyms: activity
(noun) the state of being active Synonyms: action, activity
activewear (noun) attire worn for sport or for casual wear Synonyms: athletic wear, sportswear
activism (noun) a policy of taking direct action to achieve a political or social goal
activist (adjective) advocating or engaged in activism Synonyms: activistic
(noun) a militant reformer Synonyms: militant
activistic (adjective) advocating or engaged in activism Synonyms: activist
activity (noun) any specific behavior
(noun) the trait of being active; moving or acting rapidly and energetically Synonyms: activeness
(noun) an organic process that takes place in the body Synonyms: bodily function, bodily process, body process
(noun) a process existing in or produced by nature (rather than by the intent of human beings) Synonyms: action, natural action, natural process
(noun) the state of being active Synonyms: action, activeness
(noun) (chemistry) the capacity of a substance to take part in a chemical reaction
actomyosin (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions
actor (noun) a theatrical performer Synonyms: histrion, player, role player, thespian
(noun) a person who acts and gets things done Synonyms: doer, worker
actress (noun) a female actor
actual (adjective) presently existing in fact and not merely potential or possible Synonyms: existent
(adjective) being or existing at the present moment
(adjective) taking place in reality; not pretended or imitated
(adjective) being or reflecting the essential or genuine character of something Synonyms: genuine, literal, real
(adjective) existing in act or fact Synonyms: factual
actualisation (noun) making real or giving the appearance of reality Synonyms: actualization, realisation, realization
actualise (verb) represent or describe realistically Synonyms: actualize
(verb) make real or concrete; give reality or substance to Synonyms: actualize, realise, realize, substantiate
actuality (noun) the state of actually existing objectively
actualization (noun) making real or giving the appearance of reality Synonyms: actualisation, realisation, realization
actualize (verb) represent or describe realistically Synonyms: actualise
(verb) make real or concrete; give reality or substance to Synonyms: actualise, realise, realize, substantiate
actually (adverb) used to imply that one would expect the fact to be the opposite of that stated; surprisingly Synonyms: in reality
(adverb) in actual fact Synonyms: really
(adverb) as a sentence modifier to add slight emphasis; as a modifier to add slight emphasis
(adverb) at present
actuarial (adjective) of or relating to the work of an actuary
actuary (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) Synonyms: statistician
actuate (verb) put in motion or move to act Synonyms: activate, set off, spark, spark off, touch off, trigger, trigger off, trip
(verb) give an incentive for action Synonyms: incite, motivate, move, prompt, propel
actuated (adjective) moved to action
actuating (adjective) causing motion or action or change Synonyms: activating
actuation (noun) the act of propelling Synonyms: propulsion
actuator (noun) a mechanism that puts something into automatic action
acuate (adjective) ending in a sharp point Synonyms: acute, needlelike, sharp
acuity (noun) a quick and penetrating intelligence Synonyms: acuteness, keenness, sharpness
(noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) Synonyms: sharp-sightedness, visual acuity
aculea (noun) small spiny outgrowth on the wings of certain insects
aculeate (adjective) having or resembling a stinger or barb Synonyms: aculeated
aculeated (adjective) having or resembling a stinger or barb Synonyms: aculeate
aculeus (noun) a sharp-pointed process especially a sting of a hymenopterous insect
(noun) a stiff sharp-pointed plant process
acumen (noun) shrewdness shown by keen insight Synonyms: insightfulness
(noun) a tapering point
acuminate (adjective) (of a leaf shape) narrowing to a slender point
(verb) make sharp or acute; taper; make (something) come to a point
acupressure (noun) treatment of symptoms by applying pressure with the fingers to specific pressure points on the body Synonyms: G-Jo, shiatsu
acupuncture (noun) treatment of pain or disease by inserting the tips of needles at specific points on the skin Synonyms: stylostixis
acute (adjective) having or experiencing a rapid onset and short but severe course
(adjective) of an angle; less than 90 degrees
(adjective) of critical importance and consequence
(adjective) having or demonstrating ability to recognize or draw fine distinctions Synonyms: discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp
(adjective) ending in a sharp point Synonyms: acuate, needlelike, sharp
(adjective) extremely sharp or severe Synonyms: intense
(noun) a mark placed above a vowel to indicate pronunciation Synonyms: acute accent, ague
acutely (adverb) having a rapid onset
(adverb) in a keen or penetrating way Synonyms: keenly
(adverb) changing suddenly in direction and degree Synonyms: sharp, sharply
(adverb) in a shrewd manner Synonyms: astutely, sagaciously, sapiently, shrewdly
acuteness (noun) the quality of having a sharp edge or point
(noun) a quick and penetrating intelligence Synonyms: acuity, keenness, sharpness
(noun) a sensitivity that is keen and highly developed
acyclic (adjective) not cyclic; especially having parts arranged in spirals rather than whorls
(adjective) having an open chain structure Synonyms: open-chain
acyclovir (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms Synonyms: Zovirax
acyl (noun) any group or radical of the form RCO- where R is an organic group Synonyms: acyl group
acylation (noun) the process of introducing an acyl group into a compound
acylglycerol (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils Synonyms: glyceride
ad (noun) a public promotion of some product or service Synonyms: advert, advertisement, advertising, advertizement, advertizing
adactylia (noun) congenital absence of fingers and/or toes Synonyms: adactylism, adactyly
adactylism (noun) congenital absence of fingers and/or toes Synonyms: adactylia, adactyly
adactylous (adjective) without fingers and/or toes
adactyly (noun) congenital absence of fingers and/or toes Synonyms: adactylia, adactylism
adage (noun) a condensed but memorable saying embodying some important fact of experience that is taken as true by many people Synonyms: byword, proverb, saw
adagio (adjective) (of tempo) leisurely
(noun) a slow section of a pas de deux requiring great skill and strength by the dancers
(noun) (music) a composition played in adagio tempo (slowly and gracefully)
(adverb) slowly
adamance (noun) resoluteness by virtue of being unyielding and inflexible Synonyms: obduracy, unyieldingness
adamant (adjective) impervious to pleas, persuasion, requests, reason Synonyms: adamantine, inexorable, intransigent
(noun) very hard native crystalline carbon valued as a gem Synonyms: diamond
adamantine (adjective) consisting of or having the hardness of adamant
(adjective) having the hardness of a diamond
(adjective) impervious to pleas, persuasion, requests, reason Synonyms: adamant, inexorable, intransigent
adamantly (adverb) inflexibly; unshakably
adapt (verb) make fit for, or change to suit a new purpose Synonyms: accommodate
(verb) adapt or conform oneself to new or different conditions Synonyms: adjust, conform
adaptability (noun) the ability to change (or be changed) to fit changed circumstances
adaptable (adjective) capable of adapting (of becoming or being made suitable) to a particular situation or use
adaptation (noun) (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light)
(noun) a written work (as a novel) that has been recast in a new form Synonyms: version
(noun) the process of adapting to something (such as environmental conditions) Synonyms: adaption, adjustment
adaptational (adjective) of or relating to adaptation
adaptative (adjective) having a capacity for adaptation Synonyms: adaptive
adapted (adjective) changed in order to improve or made more fit for a particular purpose Synonyms: altered
adapter (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible Synonyms: adaptor
(noun) a musician who adapts a composition for particular voices or instruments or for another style of performance Synonyms: arranger, transcriber
adaption (noun) the process of adapting to something (such as environmental conditions) Synonyms: adaptation, adjustment
adaptive (adjective) having a capacity for adaptation Synonyms: adaptative
adaptor (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible Synonyms: adapter
adaxial (adjective) nearest to or facing toward the axis of an organ or organism Synonyms: ventral
adaxially (adverb) in an adaxial manner
add (verb) make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of
(verb) make an addition by combining numbers Synonyms: add together
(verb) determine the sum of Synonyms: add together, add up, sum, sum up, summate, tally, tot, tot up, total, tote up
(verb) state or say further Synonyms: append, supply
(verb) bestow a quality on Synonyms: bestow, bring, contribute, impart, lend
(verb) constitute an addition
addable (adjective) capable of being added or added to Synonyms: addible
addax (noun) large antelope with lightly spiraled horns of desert regions of northern Africa Synonyms: Addax nasomaculatus
addend (noun) a number that is added to another number (the augend)
addendum (noun) textual matter that is added onto a publication; usually at the end Synonyms: postscript, supplement

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