Self-referential; structured analogously, but at a higher level.
Suppose you have a genie that grants you three wishes. If you wish for infinite wishes, that is a meta wish.
Boundary marker.
Either of the conical columns at each end of an Ancient Roman circus.
Metagame; the most effective tactics and strategies used in a competitive video game.
Prominent in the metagame; effective and frequently used in competitive gameplay.
I don't think the character will be meta even with the recent buffs.
Metoidioplasty.