A list or collection of people or entities that are known, trusted, or explicitly permitted.
(legal) A list, resembling a blacklist, for less serious offences.
(transitive) To place on a whitelist; to mark or note a person or entity as trustworthy or acceptable.
‘The email program allows you to whitelist email from known sources.’;
(internet) A technique for blocking spam (junk e-mail) by temporarily rejecting mail from unknown senders. A legitimate sender is likely to try sending again after a delay.
(transitive) To place on a greylist.