Noah Webster's Dictionary (n.) Unprovoked attack or act of hostility; the first act of injury, or first act leading to a war or a controversy; first attack; assault; as, a war of aggression. Aggressions of power.

Multi-Version Concordance Aggression (1 Occurrence) Isaiah 14:6 He whose rod was on the peoples with an unending wrath, ruling the nations in passion, with an uncontrolled rule. (See NIV)