| abridge | To shorten (a book, movie, speech, or other text) without losing the sense | |
| abscission | The natural detachment of parts of a plant, typically dead leaves and ripe fruit | |
| absolute | Not qualified or diminished in any way; total | |
| abstemious | Indulging only very moderately in something, especially food and drink | |
| abstruse | Difficult to understand; obscure | |
| abysmal | Extremely bad; appalling | |
| accede | To agree or express agreement | |
| accolade | An award or privilege granted as a special honor or as an acknowledgment of merit | |
| accretion | The process of growth or increase, typically by the gradual accumulation of additional layers or matter | |
| accumulate | To gather or collect, often in gradual degrees; heap up | |