say it: sep-ur-AY-shuhn
separation is a noun meaning "the state of lacking unity". It carries 9 recorded senses.
the state of lacking unity
coming apart
the social act of separating or parting company
“the separation of church and state”
the termination of employment (by resignation or dismissal)
(law) the cessation of cohabitation of man and wife (either by mutual agreement or under a court order)
law
the act of dividing or disconnecting
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 separation 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.