- ACME - Summit, highest point.
- ACOUSTICS - Related to sound, the sense of hearing.
- ACQUIESCENT - Accept without protest.
- ACQUIT - Declare not guilty, to free.
- ACRID - Pungent.
- ACRIMONIOUS - bitterness of language.
- ACRONYM - A word formed from the initial letters of other words.
- ACTUARIAL - Statistical techniques.
- ACTUATE - Motivate.
- ACUMEN - Shrewdness.
- ADAGE - Proverb, saying.
- ADAMANT - Hard, inflexible.
- ADAPT - Make oneself suitable.
- ADDLE - Muddle,confuse.
- ADDUCE - To bring forward, to cite.
- ADEPT - An expert, skilled.
- ADHERE - To stick.
- ADHESIVE - Sticky substance, glue.
- ADIPOSE - Of fat. eg. adipose tissue.
- ADJUDICATE - To act as judge.
