occasionally

adverb3

1. •
   sometimes, at times far apart

   • God setteth no houres for the morning or evening sacrifice because they may occasionally be changed. — 1639
2. •
   (no longer used) On the occasion of something else happening; incidentally, by the way.

   • Were nothing els discoursively inserted (as some little else occasionally presented it selfe), what paper more currently fit for the barest mechanicall uses, [...] — 1588
3. •
   (no longer used) On an occasion, accidentally, by chance.

   • Mr Tourville occasionally told his age; just turned of thirty-one. — 1748