| Term | Definition |
| apotheosis | n. elevation to godhood; an ideal example of something |
| appall | v. dismay; shock |
| apparatus | n. equipment |
| apparition | n. ghost; phantom |
| appease | v. pacify or soothe; relieve |
| appellation | n. name; title |
| append | v. attach |
| application | n. diligent attention |
| apposite | adj. appropriate; fitting |
| appraise | v. estimate value of |
| appreciate | v. be thankful for; increase in worth; be thoroughly conscious of |
| apprehend | v. arrest ( a criminal ); dread; perceive |
| apprehension | n. fear |
| apprenticeship | n. time spent as a novice learning a trade from a skilled worker |
| apprise | v. inform |
| approbation | n. approval |
| appropriate | v. aquire; take possesion of for one's own use |
| apropos | prep. with reference to; regarding |
| aptitude | n. fitness; talent |
| aquatic | adj. pertaining to water |
| aquilne | adj. curved, hooked |
| arable | adj. fit for growing crops |
| arbiter | n. a person with power to decide a dispute; judge |
| arbitrary | adj. capricious; randomly chosen; tyrannical |
| arbitrator | n. judge |
| arboretum | n. place where different tree varieties are exhibited |
| arcade | n. a covered passageway, usually lined with shops |
| arcane | adj. secret; mysterious; known only to the initiated |
| archaeology | n. study of artifacts and relics of early mankind |
| archaic | adj. antiquated |
| archetype | n. prototype; primitive pattern |
| archipelago | n. group of closely located islands |
| archives | n. public records; place where public records are kept |
| ardent | adj. intense; passionate; zealous |
| arduous | adj. hard; strenuous |
| aria | n. operatic solo |
| arid | adj. dry; barren |
| aristocracy | n. hereditary nobility; privileged class |
| armada | n. fleet of warshipts |
| aromatic | adj. fragrant |
| arousal | n. awakening; provocation ( of a response ) |
| arraign | v. charge in court; indict |
| array | v. marshal; draw up in order |
| array | v. clothe; adorn |
| arrears | n. being in debt |
| arrest | v. stop or slow down; catch someone's attention |
| arrogance | n. pride; haughtiness |
| arroyo | n. gully |
| arsenal | n. storage place for military equipment |
| articulate | adj. effective; distinct |
| artifact | n. object made by human beings, either hand made or mass produced |
| artifice | n. deception; trickery |
| artisan | n. manually skilled worker; craftsman, as opposed to artist |
| artless | adj. without guile; open and honest |
| ascendancy | n. controlling influence; domination |
| ascertain | v. find out for certain |
| ascetic | adj. practicing self-denial; austere |
| ascribe | v. refer; attribute; assign |
| aseptic | adj. preventing infection; having a cleansing effect |
| ashen | adj. ash-colored |
| asinine | adj. stupid |
| askance | adj. with a sideways or indirect look |
| askew | adj. crookedly; slanted; at an angle |
| asperity | n. sharpness ( of temper ) |
| aspirant | n. seeker after position or status |
| aspire | v. seek to attain; long for |
| assail | v. assault |
| assay | v. analyze; evaluate |
| assent | v. agree; accept |
| assert | v. declare or state with confidence; put oneself forward bodly |
| assessment | n. evaluation; judgment |
| assiduous | adj. diligent |
| assimilate | v. absorb; cause to become homogeneous |
| assuage | v. ease or lessen ( pain ); satisfy ( hunger ); soothe ( anger ) |
| assumption | n. something taken for granted; taking over or taking possession of |
| assurance | n. promise or pledge; certainty; self-confidence |
| asteroid | n. small planet |
| astigmatism | n. eye defect that prevents proper focus |