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
Inception and Day one. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/day_one/inception
Day one & Inception. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/day_one/inception>.
Inception or Day one. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/day_one/inception.
Google Ngram Viewer shows how "day one" and "inception" have occurred on timeline