characteristic

a prominent attribute or aspect of something; "the map showed roads and other features"; "generosity is one of his best characteristics"

a distinguishing quality

the integer part (positive or negative) of the representation of a logarithm; in the expression log 643 = 2.808 the characteristic is 2

any measurable property of a device measured under closely specified conditions

typical or distinctive; "heard my friend's characteristic laugh"; "red and gold are the characteristic colors of autumn"; "stripes characteristic of the zebra"