Definition of not-a-date :.
(nŏt-ə-dāt)
1. (adj.) An activity that closely resembles a date in every way except that it is not actually a date. A not-a-date activity can either be a purely platonic occurrence or can occur with a not-boyfriend or not-girlfriend.
Examples:
"What is this we have here?" "This is not-a-date!"
Kevin and Francine went to enjoy a not-a-date night at the movies.Submitted by: ContraryAshley, Topics: Behavior & Lifestyle, Love & Romance

