4 letters · 6 points in Scrabble
originAdjective etymology 1, adjective sense 1 is a back-formation from meta- (prefix). Adjective etymology 1, adjective sense 2 is derived from noun etymology 1, noun sense 1. The noun senses are clippings of various terms beginning with meta (prefix). Folk etymology for noun etymology 1, noun sense 1 also suggests an acronym for most effective/efficient tactic available.
Etymology from Wiktionary, CC BY-SA 3.0