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From our dictionary:
Pronunciation: (triv'E-ul), [key]
1. of very little importance or value; insignificant: Don't bother me with trivial matters.
2. commonplace; ordinary.
3. Biol.(of names of organisms) specific, as distinguished from generic.
a. noting a solution of an equation in which the value of every variable of the equation is equal to zero.
b. (of a theorem, proof, or the like) simple, transparent, or immediately evident.
5. Chem.(of names of chemical compounds) derived from the natural source, or of historic origin, and not according to the systematic nomenclature: Picric acid is the trivial name of 2,4,6-trinitrophenol.