Definition:(noun) a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves(noun) a quality that differentiates between similar things (noun) the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx (adjective) relating to or showing a difference; "####### treatment" (adjective) involving or containing one or more derivatives; "####### equation"
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