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English definition of “function”

function

noun  /ˈfʌŋk·ʃən/ us  

function noun (PURPOSE)

[C/U] a purpose or duty, or the way something or someone works: [U] The function of the veins is to carry blood to the heart. [C] One of your functions as receptionist is to answer the phone.

function noun (MATHEMATICAL RELATIONSHIP)

mathematics [C] a relationship between two sets in which each part of the first set is connected with just one member of the second set in number pairs

function noun (CEREMONY)

[C] a social event or official ceremony: Morse went to the White House for a ceremonial function.

function

verb [I]  /ˈfʌŋk·ʃən/ us  

function verb [I] (PERFORM PURPOSE)

to perform the purpose of a particular thing, or to perform the duties of a particular person: She quickly learned how the office functions. I’m so tired today, I can barely function. Our spare bedroom also functions as a study (= is also used for that purpose).
(Definition of function from the Cambridge Academic Content Dictionary © Cambridge University Press)
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