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on-(4) (iou)



on- prefix.
[Unstressed form of Old English an, ON preposition A preposition1. Cf. combs. of ON preposition, ON adjective.]
In various senses of 'on' forming verbs (chiefly obs.), adjectives from pples, verbal nouns & nouns of action (sometimes concrete), as oncoming, onlay, onset; also forming other types of noun, as on-drive.