- (philosophy) A language or a part of a language that is used to speak about objects but not about sentences or propositions.
- (lexicography) the language of the headwords in a dictionary (in a French-to-English translation dictionary, French is the object language)
- (computing) target language; the language of the object code, the output of a compiler (not necessarily executable machine code)
language speaking about objects rather than about language
lexicography: language of headwords