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English

From Middle English un-, from Old English un-, from Proto-Germanic *un-, from Proto-Indo-European *n̥-. Cognate with Scots un-, on- (un-), North Frisian ün-, Saterland Frisian uun-, West Frisian ûn-, on-, Dutch on-, Low German un-, on-, German un-, Danish u-, Swedish o-, Norwegian u-, Icelandic ó-. More distant cognate with Latin in-, Ancient Greek ἀ- (a-) (whence English a-, modern Greek α- (a-)) and Sanskrit अ- (a-).

Doublet of in- and a-.

German

From Proto-Germanic *un-, from Proto-Indo-European *n̥-.

Luxembourgish

Compare German an-, Dutch aan-, English on-.

Manx

From un (one, single).

Old English

From Proto-Germanic *un-, from Proto-Indo-European *n̥-, a prefix use of the particle *ne (not). Cognate with Old Saxon un-, Dutch on-, Old High German un- (German un-), Old Norse ó- (Swedish o-, Norwegian u-), and Gothic 𐌿𐌽- (un-). The Indo-European root is also the source of Ancient Greek ἀ- (a-), ἀν- (an-), Latin in-, and Old Irish in-.