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English definition of “de facto”

de facto

adjective [before noun], adverb uk   /ˌdeɪˈfæk.təʊ/ us    /-toʊ/ formal
existing in fact, although perhaps not intended, legal, or accepted: The city is rapidly becoming the de facto centre of the financial world. He's her de facto husband though they're not actually married. English is de facto the common language of much of the world today. If it is on British soil then it is de facto British.
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de facto

noun [C] uk   /ˌdeɪˈfæk.təʊ/ us    /-toʊ/ Australian English formal
(also defacto) a person someone lives with as a wife or a husband, although they are not married: They've invited Joanne and her de facto for lunch on Sunday.
(Definition of de facto from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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