in·ten·tion·al·i·ty (?n-t?n?sh?-n?l??-t?) n. pl. in·ten·tion·al·i·ties 1. The state of having or being formed by an intention. 2. Philosophy The property of being about or directed toward an object or end, especially as attributed to conscious states, beliefs, or other mental phenomena such as language. American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.