Definition of metas:
(n) :
(by extension, countable, Internet slang) An informal but widely adopted practice in a given field; a de facto standard.
(adj) :
(informal) Self-referential; structured analogously (structured by relationships), but at a higher level.
(adj) :
(video games) Prominent in the metagame; effective and frequently used in competitive gameplay.
(n) :
Boundary marker.
(n) :
(historical) Either of the conical columns at each end of an Ancient Roman circus.
(n) :
Meta Platforms, Inc., formerly Facebook, Inc. (until late 2021): an American multinational technology conglomerate holding company that is the parent organization of Facebook, Instagram, and WhatsApp, among other subsidiaries.