sub·men·tion (noun informal): 1. A post about someone or something on a personal website where one neglects (accidentally or on purpose) to either send a webmention and/or syndicate a copy out to an appropriate social silo. 2. Such a post which explicitly has the experimental microformat rel=”nomention” which prevents webmention code from triggering for the attached URL. 3. Any technologically evolved form of apophasis (Greek ἀπόφασις from ἀπόφημι apophemi, “to say no”) which sends no notifications using standard Internet or other digital protocols.
Early 21st century: a blend or portmanteau of subliminal and webmention.