WordReference Random House Unabridged Dictionary of American English © 2025
bi•na•tion
(bī nā′shən),USA pronunciation n.
- celebration of Mass twice on the same day by the same priest.
- Neo-Latin bīnātiōn- (stem of bīnātiō), equivalent. to Latin bīn(ī) bin- + -ātiōn- -ation