English

endofunction

From endo- + function.

Proto-Indo-European *h₁n̥dóm ‘inside’

Proto-Hellenic *éndon

Ancient Greek ἔνδον ‘inner’

English endo-

Proto-Indo-European *bʰewg- ‘to enjoy’

…

Latin fungor ‘to perform’

Latin fūnctiō ‘performance’

Old French fonction

Middle French function

Today it means

noun A function whose codomain is equal to its domain.

Language periods are conventional ranges, not dates for this word.

Etymograph / endofunction