1an activity that is natural to or the purpose of a person or thing:bridges perform the function of providing access across waterbodily functions
[mass noun] practical use or purpose in design:building designs that prioritize style over function
a basic task of a computer, especially one that corresponds to a single instruction from the user.
2 Mathematics a relation or expression involving one or more variables:the function (bx + c)
a variable quantity regarded in relation to one or more other variables in terms of which it may be expressed or on which its value depends:the magnetic field has varied as a function of time
Chemistry a functional group:the carboxyl group was replaced by functions that included tetrazolyl-, sulphonyl-, and phosphoryl-
3a thing dependent on another factor or factors:class shame is a function of social power
4a large or formal social event or ceremony:he was obliged to attend party functions
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Universal
work or operate in a proper or particular way:her liver is functioning normally
(function as) fulfil the purpose or task of (a specified thing):the museum intends to function as an educational and study centre