Meaning of “functional” in the English Dictionary

"functional" in British English

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functionaladjective

uk /ˈfʌŋk.ʃən.əl/ us /ˈfʌŋk.ʃən.əl/

functional adjective (WORKING NORMALLY)

(of a machine, system, etc.) working in the usual way:

Is the central heating functional yet?

performing a particular operation:

a functional disorder (= when an organ does not work as it should)

functional adjective (LANGUAGE)

specialized language relating to language functions, for example saying sorry, asking for something, or refusing something:

The course will teach participants functional language.
Spanish functional phrases being taught to the police include "Calm down", "Speak Slower" and "You're under arrest".

(Definition of “functional” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"functional" in American English

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functionaladjective

us /ˈfʌŋk·ʃə·nəl/

intended to be used; practical rather than attractive:

Our furniture isn’t very fancy, but it’s functional.
Is the plumbing functional yet (= does it work)?
functionally
adverb /ˈfʌŋk·ʃə·nəl·i/

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

"functional" in Business English

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functionaladjective

uk /ˈfʌŋkʃənəl/ us

working in the expected or necessary way:

The timeline is for the site to be fully functional in 18 months.

HR, WORKPLACE relating to the different areas of skill in a business:

functional areas/departments/expertise Taxpayers will save time and resources by dealing with one team rather than several different functional areas.

designed for a practical purpose rather than for the way something looks:

highly functional but stylistically unremarkable designs
functionally
adverb

The new business plan rendered the department's computers functionally obsolete.

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