| ̷ ̷ ̷ ̷|dentlē, -t ə lē, -li adverb
1. : by chance : as a matter of minor import : casually
in this discussion grave questions were incidentally brought up
2. : by way of interjection or digression : in passing : parenthetically
touching incidentally on the waterpower values
another leading industry, incidentally , has quadrupled its business in five years