Longman Dictionary of Contemporary English
Douglas Harper's Etymology Dictionary
Wiktionary
n. Someone who is not a member (of a club, institution, etc.)
Usage examples of "non-member".
As far as we're concerned, FATF is the group that sets up money laundering counter-measures in non-member countries.
Associated Press was collectively organized to secure competitive advantages for members over non-members and, as such, was in restraint of trade, even though the non-members were not necessarily prevented altogether from competing.
But the way the union has got whole districts of the city sewn up now and insists on kickbacks and drives non-members out of the area - that's more than I can swallow!
Hayes was one of several non-members who attended occasionally to listen to the after-dinner whopper, paying his own check, and, of course, being forbidden to participate.
Ground rules for inviting non-members should be worked out before the first time it happens, as this is a common cause for friction.
James came to the railing that prevented non-members from entering the trading floor, and one of the guards opened the gate.