| Term | Definition |
| abandon | to leave or stop looking for |
| abnormality | something not normal |
| absurdity | foolishness |
| accelerate | to increase speed |
| accessible | easy to reach or obtain |
| accolade | a reward, praise |
| adamant | firm and unyielding |
| adhere | to stick or hold |
| admonish | to warn |
| adrenaline | a hormone that prepares the body for action |
| alliteration | the repetition of consonant sounds for effect |
| allocate | to set aside |
| amateur | a person who does something for enjoyment, not money |
| ambidextrous | able to use both hands equally well |
| anesthetic | a drug that causes a loss of feeling |
| animosity | hatred |
| anonymous | unknown |
| apathetic | not showing strong feeling, indifferent |
| astonish | to amaze |
| atrocity | a cruel act |