As a minor or subordinate matter: by profession a lawyer and incidentally a musician. (adverb)
Apart from the main subject; parenthetically.(adverb)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "incidentally" in a sentence
"It is a title incidentally which, in the political sense, might well be applied to modern Turkey as a whole."
"That front leaf, incidentally, is about as wide as my head."
"This, incidentally, is an international bank headquartered (or at least once headquartered) in the Basque industrial city of Bilbao, Spain."