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
Source
Source noun - A point or place at which something is invented or provided.
Usage example: a source of inspiration
Mutual synonyms
Both terms in one sentence
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His repeating spiel has been a source of amusement and annoyance for players since day one.
Source: Chewing the Scenery
Cite this Source
Source and Day one. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/day_one/source
Day one & Source. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/day_one/source>.
Source or Day one. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/day_one/source.
Google Ngram Viewer shows how "day one" and "source" have occurred on timeline