Day one
Day one noun - The point at which something begins.
Usage example: since day one of this project, we've always insisted that we would create the best product possible without any consideration of cost
Mutual synonyms
Cite this Source
Launch and Day one. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/day_one/launch
Day one & Launch. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/day_one/launch>.
Launch or Day one. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/day_one/launch.
Google Ngram Viewer shows how "day one" and "launch" have occurred on timeline