| aghast | Filled with horror or shock | |
| alacrity | To feel or express strong disapproval of something | |
| algorithm | A process or set of rules to be followed in calculations or other problem-solving operations, especially by a computer | |
| allusion | An indirect or passing reference to an event, person, place, or artistic work that is not elaborately discussed in the context | |
| altruistic | Showing a disinterested and selfless concern for the well-being of others; unselfish | |
| amalgamate | To combine or unite to form one organization or structure | |
| ambiguity | The quality of being open to more than one interpretation; inexactness | |
| ambivalence | The state of having mixed feelings or contradictory ideas about something or someone | |
| ameliorate | To make something bad or unsatisfactory better | |
| amenable | Willing to agree or to accept something that is wanted or asked for | |