Ag"gre*ga`tor (&?;), n. One who aggregates.
Ag*grege" (&?;), v. t. [OF. agreger. See Aggravate.] To make heavy; to aggravate. [Obs.] Chaucer.
Ag*gress" (&?;), v. i. [imp. & p. p. Aggressed (&?;); p. pr. & vb. n. Aggressing.] [L. aggressus, p. p. of aggredi to go to, approach; ad + gradi to step, go, gradus step: cf. OF. aggresser. See Grade.] To commit the first act of hostility or offense; to begin a quarrel or controversy; to make an attack; -- with on.