Meaning of “de facto” in the English Dictionary

"de facto" in British English

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de factoadjective [ before noun ], adverb

uk /ˌdeɪ ˈfæk.təʊ/ us /ˌdeɪ ˈfæk.toʊ/ formal

de factonoun [ C ]

uk /ˌdeɪ ˈfæk.təʊ/ us /ˌdeɪ ˈfæk.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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"de facto" in American English

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de factoadjective, adverb [ not gradable ]

us /dɪˈfæk·toʊ, deɪ-/

(Definition of “de facto” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"de facto" in Business English

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de factoadjective [ before noun ]

uk us

existing in fact, but not officially decided or approved:

A year ago he assumed de facto control of the company from his aging father.
The software they produced eventually became the de facto standard for printable web documents.
de facto
adverb

The agreement existed de facto, although it had not been formalized in law.

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(Definition of “de facto” from the Cambridge Business English Dictionary © Cambridge University Press)