On-

Alternative forms

• a-, an-

Origin

From Middle English on-, from Old English on-, an-, from Proto-Germanic *an-, *ana- ("on-"), from Proto-Indo-European *ano-, *nō- ("on"). Cognate with Dutch aan-, German an-, Swedish an-.

Full definition of on-

Prefix

1. Prefix meaning on, at, toward, upon.oncome, onset, onfall, onlay

Derived terms