say it: uh-GRESH-uhn
aggression is a noun meaning "a disposition to behave aggressively". It carries 5 recorded senses.
a disposition to behave aggressively
a feeling of hostility that arouses thoughts of attack
violent action that is hostile and usually unprovoked
deliberately unfriendly behavior
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for aggression come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.