| trial and error(noun, expression, idiom, check, approval) | |
| trial run(noun, expression, check, approval, examination) | |
| try(noun, check, approval, examination, standard) | |
| verification(noun, check, approval, examination, standard) | |
| walk-up(noun, approach, kickoff, warm-up, lead-in) | |
| windup(noun, regression) | |
| yardstick(noun, check, approval, examination, standard) | |
| zero hour(noun, expression, idiom, moment) | |
| quiz(noun, check, approval, examination, standard) | |
| confirmation(noun, check, approval, examination, standard) | |
| curtain lifter(noun, expression, approach, kickoff, warm-up) | |
| curtain raiser(noun, expression, idiom, event) | |
| formula | |
| start(noun, beginning, opening, birth, onset) | |
| test(noun, check, examination, trial, quiz) | |
| A-day | |
| D-day | |
| H-hour | |
| alpha(noun, start, beginning, opening, birth) | |
| appointed hour |
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| APA | Smart Define. (2013). countdown thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/countdown/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "countdown thesaurus" https://smartdefine.org/countdown/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2013, countdown thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/countdown/thesaurus/synonyms>. |
| MLA | Smart Define. "countdown thesaurus" 17 June 2013. Web. 21 September 2026. <https://smartdefine.org/countdown/thesaurus/synonyms> |