partial function
Definition from Wiktionary, the free dictionary
English[edit]
Noun[edit]
partial function (plural partial functions)
 (mathematics) A function whose domain is a subset of some set
Antonyms[edit]
 (mathematics: function whose domain is a subset of some set): total function
Translations[edit]
mathematics: a function whose domain is a subset of some set

Usage notes[edit]
This is not a formal term, but a metamathematical description which only assumes concrete meaning in context. For example, in computability theory, a partial function is a function whose domain is a subset of for some k, but in other fields the term has other meanings.