occasionally
On occasion: at relatively infrequent intervals, from time to time, sometimes.
Other meanings
On an occasion, accidentally, by chance.
On the occasion of something else happening; incidentally, by the way.
Word history
From Middle English "occasionally".
Where this comes from
This definition is adapted from “occasionally” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.