1. (adj) on
in operation or operational
Antonyms: cancelled, disconnected, off
2. (adverb) on
(of events) planned or scheduled
Antonyms: disconnected, off, cancelled
3. (adverb) along, on
with a forward motion
Synonyms: along, on
Antonyms: cancelled, disconnected, off
4. (adverb) on
indicates continuity or persistence or concentration
Synonyms: along
Antonyms: off, disconnected, cancelled
5. (adverb) on
in a state required for something to function or be effective
Synonyms: along
Antonyms: cancelled, off, disconnected
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Synonyms and Antonyms of on 
