| in partnership | |
| in passing | |
| in real time | |
| in short order(expression, idiom, quickly, rapidly, soon) | |
| in the bud(expression, idiom, soon, swiftly, snappily) | |
| in time(expression, soon, swiftly, proximately, snappily) | |
| in two shakes | |
| incontinently | |
| inharmony | |
| instant(adjective, adverb, time, direct, prompt) | |
| jointly | |
| just | |
| lickety split(expression, adverb, soon, swiftly, snappily) | |
| like a bat out of hell(expression, idiom, soon, swiftly, snappily) | |
| like a flash(expression, idiom, quickly, rapidly, soon) | |
| like lightning(expression, quickly, rapidly, speedily) | |
| like wildfire(expression, quickly, rapidly, soon, swiftly) | |
| more rapidly(expression, adverb, soon, swiftly, snappily) | |
| mutually | |
| newly(first, now, directly, immediately, promptly) |
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| APA | Smart Define. (2015). at once thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/at_once/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "at once thesaurus" https://smartdefine.org/at_once/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, at once thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/at_once/thesaurus/synonyms>. |
| MLA | Smart Define. "at once thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/at_once/thesaurus/synonyms> |