Definition of function

The word "function" has its roots in Latin, from the verb "functionem", which means "to perform" or "to do". In English, the word "function" first appeared in the 14th century, borrowed from the Latin word. Initially, it referred to performing or executing an action, deed, or task. Over time, the meaning expanded to include the sense of a thing's purpose or intended use, such as the function of a machine part or the function of an organ in the body. In mathematics, the word "function" was introduced in the 17th century, referring specifically to a relation between variables that assigns each input a unique output. This mathematical concept built upon the earlier meaning of the word, emphasizing the idea of a thing performing or executing a specific role or action. Today, the word "function" is used in various contexts, from mathematics and science to everyday language, often referring to a thing's purpose, role, or intended use.