Entry 1 sense Webster, 1913 Crenelation /(-?"sh?n)/ · Cren·el·a·tion · IPA 01 n. The act of crenelating, or the state of being crenelated; an indentation or an embrasure. 1. The act of crenelating, or the state of being crenelated; an indentation or an embrasure.