clade definitions

WordNet (r) 3.0 (2005)

n
1: a group of biological taxa or species that share features inherited from a common ancestor

Merriam Webster's

noun Etymology: Greek klados Date: 1911 a group of biological taxa (as species) that includes all descendants of one common ancestor

Oxford Reference Dictionary

n. Biol. a group of organisms evolved from a common ancestor. Etymology: Gk klados branch