ingroup noun 2verb 1forms 3 noun2 •The social group that one belongs to. •In cladistics, the monophyletic group that includes all taxa of interest to the current study.A cladistic analysis of 45 ingroup and two outgroup taxa was performed on the basis of 134 characters. — 2009 verb1 •To form an ingroup. formsingrouped · ingrouping · ingroups
