— simultaneously , adv. — simultaneousness simultaneity /suy'meuhl teuh nee"i tee, sim'euhl-/ , n.
/suy'meuhl tay"nee euhs, sim'euhl-/ , adj.
existing, occurring, or operating at the same time; concurrent: simultaneous movements; simultaneous translation.
[ 1650-60; simul together (see SIMILAR) + (INSTAN)TANEOUS ]
Syn . synchronous, coincident.