| online | (adjective) connected to a computer network or accessible by computer | Synonyms: on-line |
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| (adjective) on a regular route of a railroad or bus or airline system | Synonyms: on-line |
| (adjective) being in progress now | Synonyms: on-line |
| onlooker | (noun) someone who looks on | Synonyms: looker-on |
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| only | (adjective) exclusive of anyone or anything else | Synonyms: alone |
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| (adjective) being the only one; single and isolated from others | Synonyms: lone, lonesome, sole, solitary |
| (adverb) with nevertheless the final result | - |
| (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 | - |