say it: in-TAHY-ur-tee
entirety is a noun meaning "the state of being total and complete". It carries one recorded sense.
the state of being total and complete
“he read the article in its entirety”
“appalled by the totality of the destruction”
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 entirety 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.