function
n. C / Un. the special purpose or job that a thing or person has. You use this word to talk about what something is supposed to do.
n. the special purpose, role, or activity for which an entity exists or is used. Frequently applied in technical contexts to describe the specific operational role of a component.
The main function of the heart is to pump blood.
The new software update adds a search function that makes it much easier to find old messages.
Although the architectural design is visually striking, the building's primary function as a hospital requires that aesthetic choices never compromise patient care or medical efficiency.
From Middle French function, from Old French fonction, from Latin functiō (“performance, execution”), from functus, perfect participle of fungor (“to perform, execute, discharge”), from Proto-Indo-European *bʰewg- (“to enjoy”).
Frequently followed by the preposition 'of' to specify the entity, or an infinitive clause to describe the purpose.