| obbligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obligato |
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| (noun) a persistent but subordinate motif | Synonyms: obligato |
| obduracy | (noun) resoluteness by virtue of being unyielding and inflexible | Synonyms: adamance, unyieldingness |
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| obdurate | (adjective) showing unfeeling resistance to tender feelings | Synonyms: flint, flinty, granitic, stony |
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| (adjective) stubbornly persistent in wrongdoing | Synonyms: cussed, obstinate, unrepentant |
| obdurately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obstinately, pig-headedly, stubbornly |
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| obeah | (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas | Synonyms: obi |
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| (noun) (West Indies) followers of a religious system involving witchcraft and sorcery | Synonyms: obi |
| obeche | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: arere, obechi, samba, Triplochiton scleroxcylon |
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| (noun) the wood of an African obeche tree; used especially for veneering | - |
| obechi | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: arere, obeche, samba, Triplochiton scleroxcylon |
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| obedience | (noun) the act of obeying; dutiful or submissive behavior with respect to another person | Synonyms: obeisance |
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| (noun) behavior intended to please your parents | Synonyms: respect |
| (noun) the trait of being willing to obey | - |
| obedient | (adjective) dutifully complying with the commands or instructions of those in authority | - |
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| obediently | (adverb) in an obedient manner | Synonyms: yieldingly |
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| obeisance | (noun) the act of obeying; dutiful or submissive behavior with respect to another person | Synonyms: obedience |
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| (noun) bending the head or body or knee as a sign of reverence or submission or shame or greeting | Synonyms: bow, bowing |
| obelion | (noun) the craniometric point on the sagittal suture near the lamboid suture | - |
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| obelisk | (noun) a stone pillar having a rectangular cross section tapering towards a pyramidal top | - |
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| (noun) a character used in printing to indicate a second cross reference or footnote when the asterisk has already been used | Synonyms: dagger |
| obese | (adjective) excessively fat | Synonyms: corpulent, rotund, weighty |
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| obesity | (noun) more than average fatness | Synonyms: corpulency, fleshiness |
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| obey | (verb) be obedient to | - |
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| obfuscate | (verb) make obscure or unclear | - |
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| obfuscation | (noun) the activity of obscuring people's understanding, leaving them baffled or bewildered | Synonyms: mystification |
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| (noun) darkening or obscuring the sight of something | - |
| (noun) confusion resulting from failure to understand | Synonyms: bafflement, befuddlement, bemusement, bewilderment, mystification, puzzlement |
| obi | (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas | Synonyms: obeah |
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| (noun) (West Indies) followers of a religious system involving witchcraft and sorcery | Synonyms: obeah |
| obiism | (noun) belief in a kind of sorcery that originated in Africa and is practiced in the West Indies | - |
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| obit | (noun) a notice of someone's death; usually includes a short biography | Synonyms: necrology, obituary |
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| obituary | (noun) a notice of someone's death; usually includes a short biography | Synonyms: necrology, obit |
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| object | (noun) a tangible and visible entity; an entity that can cast a shadow | Synonyms: physical object |
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| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: aim, objective, target |
| (noun) the focus of cognitions or feelings | - |
| (noun) (computing) a discrete item that provides a description of virtually anything known to a computer | - |
| (noun) (grammar) a constituent that is acted upon | - |
| (verb) express or raise an objection or protest or criticism or express dissent | - |
| (verb) be averse to or express disapproval of | - |
| objectification | (noun) the act of representing an abstraction as a physical thing | - |
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| (noun) a concrete representation of an abstract idea or principle | - |
| objectify | (verb) make impersonal or present as an object | Synonyms: depersonalise, depersonalize |
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| (verb) make external or objective, or give reality to | Synonyms: exteriorise, exteriorize, externalise, externalize |
| objection | (noun) (law) a procedure whereby a party to a suit says that a particular line of questioning or a particular witness or a piece of evidence or other matter is improper and should not be continued and asks the court to rule on its impropriety or illegality | - |
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| (noun) the act of protesting; a public (often organized) manifestation of dissent | Synonyms: dissent, protest |
| (noun) the speech act of objecting | - |
| (noun) the act of expressing earnest opposition or protest | Synonyms: expostulation, remonstrance, remonstration |
| objectionable | (adjective) causing disapproval or protest | Synonyms: obnoxious |
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| (adjective) liable to objection or debate; used of something one might take exception to | Synonyms: exceptionable |
| objectionableness | (noun) the quality of being hateful | Synonyms: hatefulness, obnoxiousness |
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| objectionably | (adverb) in an obnoxious manner | Synonyms: obnoxiously, offensively |
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| objective | (adjective) undistorted by emotion or personal bias; based on observable phenomena | Synonyms: nonsubjective |
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| (adjective) serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes | Synonyms: accusative |
| (adjective) belonging to immediate experience of actual things or events | - |
| (adjective) emphasizing or expressing things as perceived without distortion of personal feelings or interpretation | - |
| (noun) the lens or system of lenses in a telescope or microscope that is nearest the object being viewed | Synonyms: object glass, object lens, objective lens |
| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: aim, object, target |
| objectively | (adverb) with objectivity | - |
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| objectiveness | (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | Synonyms: objectivity |
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| objectivity | (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | Synonyms: objectiveness |
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| objectivization | (noun) the act or process of making or becoming objective. | - |
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| objector | (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, protester |
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| objurgate | (verb) express strong disapproval of | Synonyms: condemn, decry, excoriate, reprobate |
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| (verb) censure severely | Synonyms: castigate, chasten, chastise, correct |
| objurgation | (noun) rebuking a person harshly | Synonyms: chiding, scolding, tongue-lashing |
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| oblanceolate | (adjective) (of a leaf shape) having a broad rounded apex and a tapering base | - |
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| oblate | (adjective) having the equatorial diameter greater than the polar diameter; being flattened at the poles | Synonyms: pumpkin-shaped |
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| (noun) a lay person dedicated to religious work or the religious life | - |
| oblateness | (noun) the property possessed by a round shape that is flattened at the poles | Synonyms: ellipticity |
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| oblation | (noun) the act of contributing to the funds of a church or charity | Synonyms: offering |
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| obligate | (adjective) restricted to a particular condition of life | - |
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| (verb) bind by an obligation; cause to be indebted | Synonyms: bind, hold, oblige |
| (verb) commit in order to fulfill an obligation | - |
| (verb) force somebody to do something | Synonyms: compel, oblige |
| obligated | (adjective) caused by law or conscience to follow a certain course | - |
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| obligation | (noun) the social force that binds you to the courses of action demanded by that force | Synonyms: duty, responsibility |
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| (noun) a legal agreement specifying a payment or action and the penalty for failure to comply | - |
| (noun) a written promise to repay a debt | Synonyms: certificate of indebtedness, debt instrument |
| (noun) a personal relation in which one is indebted for a service or favor | Synonyms: indebtedness |
| (noun) the state of being obligated to do or pay something | - |
| obligational | (adjective) relating or constituting or qualified to create a legal or financial obligation | - |
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| obligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obbligato |
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| (noun) a persistent but subordinate motif | Synonyms: obbligato |
| obligatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, mandatorily |
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| (adverb) in an obligatory manner | - |
| obligatory | (adjective) morally or legally constraining or binding | - |
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| (adjective) required by obligation or compulsion or convention | - |
| oblige | (verb) bind by an obligation; cause to be indebted | Synonyms: bind, hold, obligate |
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| (verb) provide a service or favor for someone | Synonyms: accommodate |
| (verb) force somebody to do something | Synonyms: compel, obligate |
| obliged | (adjective) under a moral obligation to do something | Synonyms: duty-bound |
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| obliger | (noun) someone who performs a service or does a favor | Synonyms: accommodator |
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| obliging | (adjective) showing a cheerful willingness to do favors for others | Synonyms: complaisant |
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| obligingly | (adverb) in accommodation | Synonyms: accommodatingly |
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| obligingness | (noun) a disposition or tendency to yield to the will of others | Synonyms: complaisance, compliance, compliancy, deference |
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| oblique | (adjective) slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled | - |
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| (adjective) indirect in departing from the accepted or proper way; misleading | Synonyms: devious |
| (noun) a diagonally arranged abdominal muscle on either side of the torso | Synonyms: abdominal external oblique muscle, external oblique muscle, musculus obliquus externus abdominis |
| (noun) any grammatical case other than the nominative | Synonyms: oblique case |
| obliquely | (adverb) at an oblique angle | Synonyms: aslant, athwart |
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| (adverb) to, toward or at one side | Synonyms: sidelong, sideways |
| obliqueness | (noun) the property of being neither parallel nor perpendicular, but at a slanting angle | - |
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| (noun) the quality of being oblique and rambling indirectly | Synonyms: deviousness |
| obliquity | (noun) the quality of being deceptive | Synonyms: deceptiveness |
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| (noun) the presentation during labor of the head of the fetus at an abnormal angle | Synonyms: asynclitism |
| obliterable | (adjective) able to be obliterated completely | Synonyms: removable |
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| obliterate | (adjective) reduced to nothingness | Synonyms: blotted out, obliterated |
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| (verb) remove completely from recognition or memory | Synonyms: efface |
| (verb) make undecipherable or imperceptible by obscuring or concealing | Synonyms: blot out, hide, obscure, veil |
| (verb) mark for deletion, rub off, or erase | Synonyms: kill, wipe out |
| (verb) do away with completely, without leaving a trace | - |
| obliterated | (adjective) reduced to nothingness | Synonyms: blotted out, obliterate |
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| obliteration | (noun) destruction by annihilating something | Synonyms: annihilation |
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| (noun) the complete destruction of every trace of something | Synonyms: eradication |
| obliterator | (noun) an eliminator that does away with all traces | - |
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| oblivion | (noun) total forgetfulness | Synonyms: obliviousness |
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| (noun) the state of being disregarded or forgotten | Synonyms: limbo |
| oblivious | (adjective) failing to keep in mind | Synonyms: forgetful |
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| (adjective) (followed by `to' or `of') lacking conscious awareness of | Synonyms: unmindful |
| obliviousness | (noun) total forgetfulness | Synonyms: oblivion |
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| oblong | (adjective) deviating from a square or circle or sphere by being elongated in one direction | - |
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| (adjective) (of a leaf shape) having a somewhat elongated form with approximately parallel sides | - |
| (noun) a plane figure that deviates from a square or circle due to elongation | - |
| oblongness | (noun) the property of being shaped like a rectangle | Synonyms: rectangularity |
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| obloquy | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, calumny, defamation, hatchet job, traducement |
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| (noun) state of disgrace resulting from public abuse | Synonyms: opprobrium |
| obnoxious | (adjective) causing disapproval or protest | Synonyms: objectionable |
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| obnoxiously | (adverb) in an obnoxious manner | Synonyms: objectionably, offensively |
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| obnoxiousness | (noun) the quality of being hateful | Synonyms: hatefulness, objectionableness |
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| obnubilate | (verb) make unclear, indistinct, or blurred | Synonyms: blur, confuse, obscure |
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| (verb) make less visible or unclear | Synonyms: becloud, befog, cloud, fog, haze over, mist, obscure |
| oboe | (noun) a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece | Synonyms: hautbois, hautboy |
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| oboist | (noun) a musician who plays the oboe | - |
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| obolus | (noun) a Greek unit of weight equal to one tenth of a gram | - |
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| obovate | (adjective) (of a leaf shape) egg-shaped with the narrower end at the base | - |
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| obscene | (adjective) suggestive of or tending to moral looseness | Synonyms: lewd, raunchy, salacious |
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| (adjective) designed to incite to indecency or lust | - |
| (adjective) offensive to the mind | Synonyms: abhorrent, detestable, repugnant, repulsive |
| obscenely | (adverb) in a lewd and obscene manner | Synonyms: lewdly |
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| (adverb) to an obscene degree | - |
| obscenity | (noun) an obscene act | - |
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| (noun) the trait of behaving in an obscene manner | Synonyms: bawdiness, lewdness, salaciousness, salacity |
| (noun) an offensive or indecent word or phrase | Synonyms: dirty word, filth, smut, vulgarism |
| obscurantism | (noun) a deliberate act intended to make something obscure | - |
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| (noun) a policy of opposition to enlightenment or the spread of knowledge | - |
| obscurantist | (noun) a person who is deliberately vague | - |
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| obscure | (adjective) difficult to find | Synonyms: hidden |
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| (adjective) marked by difficulty of style or expression | Synonyms: dark |
| (adjective) not drawing attention | Synonyms: unnoticeable |
| (adjective) not famous or acclaimed | Synonyms: unknown, unsung |
| (adjective) not clearly expressed or understood | Synonyms: vague |
| (adjective) remote and separate physically or socially | Synonyms: apart, isolated |
| (verb) make unintelligible or unclear | Synonyms: bedim, overcloud |
| (verb) make undecipherable or imperceptible by obscuring or concealing | Synonyms: blot out, hide, obliterate, veil |
| (verb) reduce a vowel to a neutral one, such as a schwa | - |
| (verb) make unclear, indistinct, or blurred | Synonyms: blur, confuse, obnubilate |
| (verb) make less visible or unclear | Synonyms: becloud, befog, cloud, fog, haze over, mist, obnubilate |
| obscurely | (adverb) in an obscure manner | - |
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| obscureness | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: abstruseness, obscurity, reconditeness |
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| (noun) the state of being humble and unimportant | Synonyms: humbleness, lowliness, unimportance |
| (noun) the state of being indistinct or indefinite for lack of adequate illumination | Synonyms: obscurity |
| obscurity | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: abstruseness, obscureness, reconditeness |
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| (noun) an obscure and unimportant standing; not well known | - |
| (noun) the state of being indistinct or indefinite for lack of adequate illumination | Synonyms: obscureness |
| obsequious | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, sycophantic, toadyish |
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| (adjective) attentive in an ingratiating or servile manner | - |
| obsequiously | (adverb) in an obsequious manner | Synonyms: servilely, subserviently |
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| obsequiousness | (noun) abject or cringing submissiveness | Synonyms: servility, subservience |
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| obsequy | (noun) a ceremony at which a dead person is buried or cremated | Synonyms: funeral |
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| observable | (adjective) capable of being seen or noticed | Synonyms: discernible, evident |
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| observably | (adverb) in a noticeable manner | Synonyms: noticeably, perceptibly |
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| observance | (noun) the act of observing; taking a patient look | Synonyms: observation, watching |
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| (noun) conformity with law or custom or practice etc. | Synonyms: honoring, honouring |
| (noun) the act of noticing or paying attention | Synonyms: notice, observation |
| (noun) a formal event performed on a special occasion | Synonyms: ceremonial, ceremonial occasion, ceremony |
| observant | (adjective) paying close attention especially to details | - |
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| (adjective) (of individuals) adhering strictly to laws and rules and customs | Synonyms: law-abiding |
| (adjective) quick to notice; showing quick and keen perception | Synonyms: observing |
| observantly | (adverb) in an observant manner | Synonyms: observingly |
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| observation | (noun) the act of observing; taking a patient look | Synonyms: observance, watching |
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| (noun) the act of making and recording a measurement | - |
| (noun) the act of noticing or paying attention | Synonyms: notice, observance |
| (noun) facts learned by observing | - |
| (noun) a remark expressing careful consideration | Synonyms: reflection, reflexion |
| observational | (adjective) relying on observation or experiment | Synonyms: data-based, experimental |
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| observatory | (noun) a building designed and equipped to observe astronomical phenomena | - |
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| (noun) a structure commanding a wide view of its surroundings | Synonyms: lookout, lookout station, observation tower |
| observe | (verb) stick to correctly or closely | Synonyms: keep, maintain |
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| (verb) make mention of | Synonyms: mention, note, remark |
| (verb) watch attentively | - |
| (verb) observe with care or pay close attention to | Synonyms: note, take note |
| (verb) discover or determine the existence, presence, or fact of by perception with the eyes | Synonyms: detect, discover, find, notice |
| (verb) follow with the eyes or the mind | Synonyms: follow, keep an eye on, watch, watch over |
| (verb) show respect towards | Synonyms: abide by, honor, honour, respect |
| (verb) behave as expected during of holidays or rites | Synonyms: celebrate, keep |
| (verb) conform one's action or practice to | Synonyms: keep |
| observed | (adjective) discovered or determined by scientific observation | Synonyms: ascertained, discovered |
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