incidentally - adverb
Grammar.com's section on the Parts of Speech discusses the demise of -ly adverbs. Click here for that discussion.
Example: They met incidentally at the convention a year before their marriage.
"incidentally - correct spelling." Grammar.com. STANDS4 LLC, 2022. Web. 25 Jun 2022. <https://www.grammar.com/incidentally-correct-spelling>.
It’s now more important than ever to develop a powerful writing style. After all, most communication takes place in reports, emails, and instant messages.