LINK / CITE ADD TO WORD LIST. noun. The definition of availability is whether someone or something can be accessed or used. An example of availability is when a classmate can meet to discuss a project on a certain date.
excuse - a defense of some offensive behavior or some failure to keep a promise etc.; he kept finding excuses to stay; every day he had a new alibi for not getting a job; his transparent self-justification was unacceptable
Definition of excuse for English Language Learners. : 1  to forgive someone for making a mistake, doing something wrong, etc., : 2  to say that (someone) is not required to do something. : 3  to allow (someone, such as a child) to leave.