10th cent. From Latin de 'id.'
From Proto-Italic *dē 'id.' From Proto-Indo-European *deh1- "by means of (this) here," instrumental of *de "here."
Romance: Western Vulgar Latin: Asturian de, Portuguese de, Galician de, Catalan de, French de, Italian di; Eastern Vuglar Latin: Aromanian di, Romanian de
Italic: Oscan dat, Umbrian da-, Faliscian de (borrowed from Latin?)
Indo-European: Celtic: Old Irish de, Old Welsh di; Germanic: Old High German zuo "to," Old Saxon tō 'id.,' English to; Hellenic: Ancient Greek δή (dé) "even"