Occasionally
Occasionally adverb - On some occasions.
Once and occasionally are semantically related. In some cases you can use "Once" instead an adverb "Occasionally".
Once
Once adverb - At an earlier or previous time.
Occasionally and once are semantically related. Sometimes you can use "Occasionally" instead an adverb "Once".
Mutual synonyms
Cite this Source
Once and Occasionally. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/occasionally/once
Occasionally & Once. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/occasionally/once>.
Once or Occasionally. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/occasionally/once.
Google Ngram Viewer shows how "occasionally" and "once" have occurred on timeline