I.a letting down, lowering, dropping, sinking (Ciceron.): “ex contentione vocis et summissione,” Cic. Off. 1, 41, 146: “(iterationes) erunt ab hac summissione orationis alienae,” id. Or. 25, 85: “nec elatio nec summissio,” i. e. depression, id. Top. 18, 71.
summissĭo (subm- ), ōnis, f. summitto,