large or immense, as a wave.
(in ancient Rome) of or pertaining to the tenth cohort of a legion.
3. Also called decuman gate.
(in ancient Rome) the main gate of a military camp, facing away from the enemy and near which
the tenth cohort of the legion was usually stationed.
< Latin decumānus, decimānus
of the tenth, large, equivalent to decim
) tenth (see decimate
) + -ānus -an