en·vi·ron·men·tal I. \ə̇n|vīrən|mentəl, (ˌ)en-, -ī(ə)rn|me-, rapid -īrə|me-\adjective : of, relating to, or produced by environment • en·vi·ron·men·tal·ly\-əlē, -əli\adverb II. adjective : involving or encompassing the spectator < environmental art > < environmental theater >