of very little importance or value; insignificant

Don't bother me with trivial matters.

commonplace; ordinary.

Biology . (of names of organisms) specific, as distinguished from generic.

Mathematics .

noting a solution of an equation in which the value of every variable of the equation is equal to zero.

(of a theorem, proof, or the like) simple, transparent, or immediately evident.

Chemistry . (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.