| on | (adverb) with a forward motion | Synonyms: along |
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| (adverb) indicates continuity or persistence or concentration | - |
| (adverb) in a state required for something to function or be effective | - |
| once | (adverb) on one occasion | Synonyms: in one case, one time |
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| (adverb) at a previous time | Synonyms: at one time, erst, erstwhile, formerly |
| (adverb) as soon as | - |
| onerously | (adverb) in an onerous manner | - |
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| only | (adverb) with nevertheless the final result | - |
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| (adverb) without any others being included or involved | Synonyms: alone, entirely, exclusively, solely |
| (adverb) and nothing more | Synonyms: but, just, merely, simply |
| (adverb) never except when | Synonyms: only if, only when |
| (adverb) in the final outcome | - |
| (adverb) as recently as | - |
| (adverb) except that | - |
| onshore | (adverb) on or toward the land | - |
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| onstage | (adverb) on the stage | - |
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| onward | (adverb) forward in time or order or degree | Synonyms: forth, forward |
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| (adverb) in a forward direction | Synonyms: ahead, forrader, forward, forwards, onwards |
| onwards | (adverb) in a forward direction | Synonyms: ahead, forrader, forward, forwards, onward |
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