| A | B |
| antiseptic n. | Anything that destroys or restrains the growth of putrefactive micro-organisms |
| antislavery adj. | Opposed to human slavery |
| antispasmodic adj. | Tending to prevent or relieve non-inflammatory spasmodic affections |
| antistrophe n. | The inversion of terms in successive classes, as in "the home of joy and the joy of home" |
| antitoxin n. | A substance which neutralizes the poisonous products of micro-organisms |
| antonym n, | A word directly opposed to another in meaning |
| anxious adj. | Distressed in mind respecting some uncertain matter |
| apathy n. | Insensibility to emotion or passionate feeling |
| aperture n. | Hole |
| apex n. | The highest point, as of a mountain |
| aphorism n. | Proverb |
| apiary n. | A place where bees are kept |
| apogee n. | The climax |
| apology n. | A disclaimer of intentional error or offense |
| apostasy n. | A total departure from one`s faith or religion |
| apostate adj. | False |
| apostle n. | Any messenger commissioned by or as by divine authority |
| apothecary n. | One who keeps drugs for sale and puts up prescriptions |
| apotheosis n. | Deification |
| appall v. | To fill with dismay or horror |
| apparent adj. | Easily understood |
| apparition n. | Ghost |
| appease v. | To soothe by quieting anger or indignation |
| appellate adj. | Capable of being appealed to. |
| appellation n. | The name or title by which a particular person, class, or thing is called |
| append v. | To add or attach, as something accessory, subordinate, or supplementary |
| appertain v. | To belong, as by right, fitness, association, classification, possession, or natural relation. |
| apposite adj. | Appropriate |
| apposition n. | The act of placing side by side, together, or in conact |
| appraise v. | To estimate the money value of |
| appreciable adj. | Capable of being discerned by the senses or intellect |
| apprehend v. | To make a prisoner of ( a person) in the name of the law |
| apprehensible adj. | Capable of being conceived |
| approbation n. | Sanction |
| appropriate adj. | Suitable for the purpose and circumstances |
| aqueduct n. | A water-conduit, particularly one for supplying a community from a distance |
| aqueous adj. | Of, pertaining to, or containing water. |
| arbiter n. | One chosen or appointed, by mutual consent of parties in dispute, to decide matters |
| arbitary adj. | Fixed or done capriciously |
| arbitrate v. | To act or give judgment as umpire |
| arbor n. | A tree |
| arboreal adj. | Of or pertaining to a tree or trees |
| arborescent adj. | Having the nature of a tree |
| arboretum n. | A botanical garden or place devoted to the cultivation of trees or shrubs |
| arboriculture n. | The cultivation of trees or shrubs |
| arcade n. | A vaulted passageway or street; a roofed passageway having shops, etc., opening from it |
| archaic adj. | Antiquated |
| archaism n. | Obsolescence |
| archangel n. | An angel of high rank |
| archbishop n. | The chief of the bishops of an ecclesiastical province in the Greek, Roman, and Anglican church |
| archdeacon n. | A high official administrator of the affairs of a diocese |
| archaeology n. | The branch of anthropology concerned with the systematic investigation of the relics of man |
| archetype n. | A prototype |