| Term | Definition |
| abscission | cutting off;detachment of parts from plants |
| absolution | forgiveness;prayer of forgiveness |
| acrid | unpleasantly pungent;bitter |
| acrodont | describes the teeth of some reptiles that have no roots and are joined to the jawbone |
| adipose tissue | fatty tissue |
| Aeolian harp | wind-sounded instrument |
| aerialist | a trapeze artist |
| agoraphobia | fear of open spaces |
| aiguille | needle-shaped rock |
| albatross | large seabird;oppressive burden |
| alderman | member of town legislating body |
| Alençon | a city in and the capital of Orne, in NW France: lace manufacture |
| ambiversion | combination of introversion and extroversion |
| amicus curiae | somebody who assists court |
| amphora | narrow-necked jar |
| anaclisis | strong emotional dependence on a mother or other nurturing person |
| anadiplosis | repetition for effect |
| Andalusia | a region in southern Spain on the Atlantic and the Mediterranean; formerly a center of Moorish civilization |
| ankh | Egyptian cross with loop at top |
| anorectic | relating to pathological appetite loss |
| antebellum | before Civil War |
| antiphlogistic | acting against inflammation or fever. |
| apocalypticism | Belief in apocalyptic prophecies |
| apotropaic | preventing evil |
| appendices | An appendage;A collection of supplementary material, usually at the end of a book |
| appurtenance | accessory;property right |
| argillaceous | of the nature of or resembling clay; clayey |
| asquint | askance;from the corner of the eye, as if suspiciously |
| assuasive | Soothing; calming |
| asyndeton | the omission of conjunctions |
| autistic | affected with or caused by autism |
| azimuth | eastward angle to object from north;horizontal angle of bearing |
| bamboozle | cheat somebody;perplex somebody |
| bandolier, bandoleer | soldier, a broad cartridge belt worn over the shoulder by soldiers |
| Bangladesh | country in south central Asia |
| arrearage | amount or amounts overdue |