1. a priori
A belief or conclusion based on assumptions or reasoning of some sort rather than actual experience or empirical evidence. Before actually encountering, experiencing, or observing a fact.
2. a posteriori.
A fact, belief, or argument that is based on actual experience, experiment, or observation. After the fact.
3. ad astra.
To the stars.
4. ad hoc.
For a particular situation, without planning or consideration of some broader purpose or application.
5. ad hominem.
Directed to a particular person rather than generally, such as an attack on a person rather than a position they are espousing.
6. ad infinitum.
Repeat forever.
7. ad lib
Short for ad libitum. As you desire, at one’s pleasure. To speak or perform without preparation.
8. ad nauseam.
Repetition that has become annoying or tiresome.
9. affidavit.
He has sworn. Sworn statement.
10. alma mater.
Nourishing, kind, bounteous mother. School from which one graduated.
11. alias.
Also known as. Otherwise known as. Less commonly as the proper meaning of at another time, otherwise.
12. alibi.
In another place. Elsewhere. Reason one couldn’t have been in a location where an act was committed.
13. alter ego.
Other self. Another side of oneself.
14. A.D.
short for anno Domini. In the year of our Lord. Number of years since the birth of Jesus Christ.
15. a.m.
Short for ante meridiem. Before midday (noon.) Morning.
16. animus.
Spirit, mind, courage anger. Animosity. Intense opposition and ill will towards something, somebody, or some social group, commonly emotional, passionate, and mean-spirited. Hatred.
17. ante.
Before. Earlier. In a Supreme Court opinion, ante refers to an earlier page of the same opinion.
18. ante bellum.
Before the war.
19. ante mortem.
Before death.
20. bona fide.
Genuine. Real. With no intention to deceive.
21. c. / ca. / or cca.
Short for circa. Around. About. Approximately. Relative to a certain year.
22. carpe diem.
Seize the day or moment. Make the best of the present rather than delay or focus on the future.
23. caveat.
Warning, caution, disclaimer, or stipulation.
24. cf.
Short for confer. Compare to. In reference to, as a comparison.
25. cogito ergo sum.
I think, therefore I am — Descartes.
26. consensus.
Agreement. General or widespread agreement.
27. corpus.
Body, especially of written or textual matter such as books and papers.
28. curriculum.
Race. Course of a race. Path of a race. Subjects comprising a course of academic study.
29. CV
Short for curriculum vitae. The course of one’s life. Resume. List of significant academic and professional accomplishments, achievements, awards, education, and training.
30. de facto.
True or matter of fact as it is, regardless of intent, good reason, authority, or official reason for being such.
31. dictum.
Something said. Noteworthy, authoritative statement or principle. Common wisdom.
32. doctor.
Teacher. Learned person. Doctor.
33. ergo.
Therefore.
34. et al.
Short for et alia (neuter plural) or et alii (masculine plural) or et aliae (feminine plural). And others. And all of the others.
45. etc.
Short for et cetera.
36. e pluribus unum.
— Out of many, one — U.S. motto.
37. ex post.
After.
38. ex post facto.
After the fact.
39. e.g.
Short for exempli gratia. For the sake of example. For example.
40. ibid.
Short for ibidem or ib idem. In the same place. For a citation, indicates that it is from the same place as the preceding citation.
41. id.
short for idem. From the same source. For a citation, indicates that it is from the same source, but not from the same location in that source. In contrast to ibidem (ibid.) which means the same location or place in the same source as the preceding citation.
42. i.e.
Short for id est. That is. In other words.