trivial

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Of little significance or value.
2. adj. Ordinary; commonplace.
3. adj. Concerned with or involving trivia.
4. adj. Biology Relating to or designating a species; specific.
5. adj. Mathematics Of, relating to, or being the solution of an equation in which every variable is equal to zero.
6. adj. Mathematics Of, relating to, or being the simplest possible case; self-evident.

Century Dictionary and Cyclopedia

1. Such as may be found everywhere; commonplace; ordinary; vulgar.
2. Trifling; insignificant; of little worth or importance; paltry.
3. Occupying one's self with trifles; trifling.
4. Of or pertaining to the trivium, or the first three liberal arts—grammar, rhetoric, and logic; hence, initiatory; rudimentary.
5. In zoology and botany: Common; popular; vernacular; not technical: noting the popular or familiar names of animals or plants, as distinguished from the technical New Latin names.
6. Specific; not generic: noting what used to be called the nomen triviale—that is, the second or specific term in the binomial technical name of an animal or a plant, such terms being often adopted or adapted from a popular name or epithet. Thus, in the several designations Homo sapiens, Felis leo, Mus muscutus, Rosa canina, the words sapiens, leo, musculus, and canina are respectively the trivial names of the species they designate. See specific, 3 .
7. In echinoderms, specifically, of or pertaining to the trivium: as, the trivial (anterior) ambulacra of a sea-urchin.
8. n. One of the three liberal arts which constitute the trivium.
9. n. A coefficient or other quantity not containing the quantities of the set considered.

Wiktionary

1. adj. Of little significance or value.
2. adj. Common, ordinary.
3. adj. Concerned with or involving trivia.
4. adj. biology Relating to or designating the name of a species; specific as opposed to generic.
5. adj. mathematics Of, relating to, or being the simplest possible case.
6. adj. mathematics Self-evident.
7. adj. Pertaining to the trivium.
8. adj. philosophy Indistinguishable in case of truth or falsity.
9. n. obsolete Any of the three liberal arts forming the trivium.

GNU Webster's 1913

1. adj. obsolete Found anywhere; common.
2. adj. Ordinary; commonplace; trifling; vulgar.
3. adj. Of little worth or importance; inconsiderable; trifling; petty; paltry.
4. adj. Of or pertaining to the trivium.
5. n. obsolete One of the three liberal arts forming the trivium.

WordNet 3.0

1. adj. concerned with trivialities
2. adj. of little substance or significance
3. adj. (informal) small and of little importance