One that performs an operation or a function.(noun)
Grammar See function word.(noun)
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 "functor" in a sentence
"In the regimented environment of LeÅniewski's logical languages this always takes place in the following way: a combining expression, which we may call a functor, precedes a left parenthesis of some kind, which is then followed by a sequence of one or more argument expressions, followed by a right parenthesis symmetric to the other one, which terminates the complex."
"Strict memoization (really hyper-strict) is centered on a family of trie functors, defined as a functor"
""functor" we need to be clear whether we're talking about one of these objects (ie a functor in the underlying category), or about a functor over this category."