| abyss | Bottomless gulf. |
| academic | Of or pertaining to an academy, college, or university. |
| academician | A member of an academy of literature, art, or science. |
| academy | Any institution where the higher branches of learning are taught. |
| accede | To agree. |
| accelerate | To move faster. |
| accept | To take when offered. |
| access | A way of approach or entrance; passage. |
| accessible | Approachable. |
| accession | Induction or elevation, as to dignity, office, or government. |
| accessory | A person or thing that aids the principal agent. |
| acclaim | To utter with a shout. |
| accommodate | To furnish something as a kindness or favor. |
| accompaniment | A subordinate part or parts, enriching or supporting the leading part. |
| accompanist | One who or that which accompanies. |
| accompany | To go with, or be associated with, as a companion. |
| accomplice | An associate in wrong-doing. |
| accomplish | To bring to pass. |
| accordion | A portable free-reed musical instrument. |
| accost | To speak to. |
| account | A record or statement of receipts and expenditures, or of business transactions. |
| accouter | To dress. |
| accredit | To give credit or authority to. |
| accumulate | To become greater in quantity or number. |
| accuracy | Exactness. |
| accurate | Conforming exactly to truth or to a standard. |
| accursed | Doomed to evil, misery, or misfortune. |
| accusation | A charge of crime, misdemeanor, or error. |
| accusatory | Of, pertaining to, or involving an accusation. |
| accuse | To charge with wrong doing, misconduct, or error. |
| accustom | To make familiar by use. |
| acerbity | Sourness, with bitterness and astringency. |
| acetate | A salt of acetic acid. |
| acetic | Of, pertaining to, or of the nature of vinegar. |
| ache | To be in pain or distress. |
| Achillean | Invulnerable. |
| achromatic | Colorless, |
| acid | A sour substance. |
| acidify | To change into acid. |
| acknowledge | To recognize; to admit the genuineness or validity of. |
| acknowledgment | Recognition. |
| acme | The highest point, or summit. |
| acoustic | Pertaining to the act or sense of hearing. |
| acquaint | To make familiar or conversant. |
| acquiesce | To comply; submit. |
| acquiescence | Passive consent. |
| acquire | To get as one's own. |
| acquisition | Anything gained, or made one's own, usually by effort or labor. |
| acquit | To free or clear, as from accusation. |
| acquittal | A discharge from accusation by judicial action. |