| Term | Definition |
| apotheosis | n. elevation to godhood |
| appall | v. dismay |
| appellation | n. name |
| append | v. attach |
| application | n. diligent attention |
| appraise | v. estimate value of |
| appreciate | v. be thankful for |
| apprehend | v. arrest |
| apprehension | n. fear |
| apprise | v. inform |
| apropos | prep. with reference to |
| aptitude | n. fitness |
| arable | adj. fit for growing crops |
| arbitrary | adj. capricious |
| arbitrator | n. judge, arbiter |
| arboretum | n. place where different tree varieties are exhibited |
| archaeology | n. study of artifacts and relics of early mankind |
| archetype | n. prototype |
| archipelago | n. group of closely located islands |
| arid | adj. dry; barren |
| armada | n. fleet of warships |
| aromatic | adj. fragrant |
| arraign | v. charge in court |
| array | v. marshal |
| array | v. clothe |
| arrears | n. being in debt |
| arrest | v. stop or slow down |
| arrogance | n. pride |
| arroyo | n. gully |
| articulate | adj. effective |
| artifice | n. deception |
| artisan | n. manually skilled worker |
| artless | adj. without guile |
| ascendancy | n. controlling influence |
| ascertain | v. find out for certain |
| ascetic | adj. practicing self-denial |
| ashen | adj. ash-colored |
| asinine | adj. stupid |
| askance | adj. with a side ways or indirect look |
| askew | adj. arookedly |
| asperity | n. sharpness |
| aspirant | n. seeker after position or status |
| aspire | v. seek to attain |
| assail | v. assault |
| apparition | ghost |
| appease | pacify or soothe |
| apposite | appropriate |
| apprenticeship | a time spent as a novice learning a trade from a skilled worker |
| approbation | approval |
| appropriate | acquire |
| aquiline | curved |
| arcade | covered passageway |
| arcane | secret |
| archaic | antiquated |
| arduous | hard |
| aria | operatic solo |
| arousal | awakening |
| arsenal | storage place for military equipment |
| ascribe | refer |
| aspersion | slander |
| assay | analyze |
| assent | agree |
| assert | declare |
| assessment | evaluation |
| assiduous | diligent |
| assimilate | absorb |
| assuage | soothe |
| assumption | something taken for granted,the taking over |
| assurance | promise or pledge;certainly;self-confidence |
| asteroid | small planet |
| astigmatism | eye defect that prevents proper focus |