To change; alter: as, to vary the conditions of an experiment.To diversify: modify; relieve from uniformity or monotony.To change to something else; transmute.To make of different kinds; make diverse or different one from another.To express variously; diversify in terms or forms of expression.In music, to embellish or alter (a melody or theme) without really changing its identity. See variation, 9.To alter or be altered in any manner; suffer a partial change; appear in different or various forms; be modified; be changeable.To differ or be different; be unlike or diverse: as, the laws of different countries vary.To become unlike one's self; undergo variation, as in purpose or opinion.To deviate; depart; swerve.To alter or change in succession; foliow alternately; alternate.To disagree; be at variance.To turn out otherwise.In math, analysis, to be subject to continual increase or decrease: as, a quantity conceived to vary, or have different values in the same equation.In biology, to be varied or subject to variation, as by natural or artificial selection; exhibit variation. See variability, 2, variation, 8, and variety, 6.n. Alteration; change; variation.