say it: hah-STIL-uh-tee
hostility is a noun meaning "a hostile (very unfriendly) disposition". It carries 4 recorded senses.
a hostile (very unfriendly) disposition
“he could not conceal his hostility”
a state of deep-seated ill-will
violent action that is hostile and usually unprovoked
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 hostility 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.