Definitions for "Apomorphy"
a derived character that is shared by all of the members of a clade, but is not possessed by the immediate ancestors of the clade
a trait that appears for the first time at a given position in the cladogram," he surgically removed any reference to what Luo had been talking about in this specific instance
A derived or specialized character. (also derived trait) more
homology which has originated as an evolutionary novelty within a group under study.