Once only
Once
Once adverb - At an earlier or previous time.
Once only and once are semantically related in in the past topic. Sometimes you can use "Once only" instead an adverb "Once".
Mutual synonyms
Cite this Source
Once and Once only. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/once_only/once
Once only & Once. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/once_only/once>.
Once or Once only. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/once_only/once.
Google Ngram Viewer shows how "once only" and "once" have occurred on timeline