- They’re is a contraction that is defined as they are.
An example of they’re is what you say when expecting guests and the doorbell rings, “They’re here.”
they're definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
they're definition by American Heritage Dictionary
Contraction of they are.