The definition of aye means a yes vote.
An example of aye is what a congressman would say when agreeing with a bill being voted on in Congress.
aye definition by Webster's New World
Origin: Middle English ai, ay ; from Old Norse ei ; from Indo-European base an unverified form aiw-, vital force from source age
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Origin: probably ; from I, person; personal (grammar) pronoun
an affirmative vote or a person voting affirmatively
aye definition by American Heritage Dictionary
also ay noun
An affirmative vote or voter: The ayes outnumber the nays on this issue. adverb
Yes; yea: voted aye on the appropriations bill.
Origin: Perhaps from Middle English *ayye : ay, always; see aye2 + ye, yes; see yea.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
also ay adverb
Always; ever: pledged their love for aye.
Origin: Middle English ai, from Old Norse ei; see aiw- in Indo-European roots.
aye - Phrases/Idioms
Naut. I understand and will obey: used in response to a command