Military .

a position of works, troops, etc., making them subject to a sweeping fire from along the length of a line of troops, a trench, a battery, etc.

the fire thus directed.

Architecture .

an axial arrangement of doorways connecting a suite of rooms with a vista down the whole length of the suite.

an axial arrangement of mirrors on opposite sides of a room so as to give an effect of an infinitely long vista.

Military . to attack with an enfilade.