n. 1. aggravation or aggression. [ informal British usage ] I skipped it because it was too much aggro [ WordNet 1.5 ]
v. t. [ imp. & p. p. Aggrouped p. pr. & vb. n. Aggrouping. ] [ F. agrouper; à (L. ad) + groupe group. See Group.. ] To bring together in a group; to group. Dryden. [ 1913 Webster ]
n. Arrangement in a group or in groups; grouping. [ 1913 Webster ]