say it: bi-HAY-vyur
behavior is a noun meaning "manner of acting or controlling yourself". It carries 4 recorded senses.
manner of acting or controlling yourself
(behavioral attributes) the way a person behaves toward other people
(psychology) the aggregate of the responses or reactions or movements made by an organism in any situation
psychology
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 behavior 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.