1. An action performed by a device, department, or person that produces a result. Function remains more or less fixed whereas the purpose (which indicates intention or objective) generally changes. For example, the function of a hammer is to strike something nearby whereas its purpose (what to strike and why) could be anything the hammer-wielder has in mind.
2. Mathematics: A mathematical relationship in which a quantity (dependent variable) depends on or is determined by another quantity (independent variable) or quantities. The dependent variable is said to be a function of the independent variable(s).
If something is done, or something happens, to the independent variable(s), it is reflected in the dependent variable. For example, expenditure is a function of income and, for a wage earner, income is a function of two variables: per hour wage rate and number of hours worked.
3. See business function.
Use 'function' in a Sentence
There is a cartilage and a viscous fluid between the two bones of the knee joint which function as lubricants when we move our legs.
Professor Zhao demonstrated to his calculus students that, without the proper formula, the equation would not be able to function.
In most offices, the intended function of the break-room or office kitchen is to serve as a social hub and place of relaxation for workers during the day.
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