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.

Ag*gress", v. t. To set upon; to attack. [R.]

Ag*gress", n. [L. aggressus.] Aggression. [Obs.]

Their military aggresses on others.
Sir M. Hale.

• aggression.
  
• To set upon; to attack.
  
• To commit the first act of hostility or offense; to begin a quarrel or controversy; to make an attack; with on.