a line of police, sentinels, military posts, warships, etc., enclosing or guarding an area.

a cord or braid worn for ornament or as a fastening.

a ribbon worn usually diagonally across the breast as a badge of a knightly or honorary order.

Fortification .

a projecting course of stones at the base of a parapet.

the coping of a scarp.

Architecture .

a stringcourse, esp. one having little or no projection.

a cut-stone riser on a stepped ramp or the like.

a fruit tree or shrub trained to grow along a support or a series of such supports.

to surround or blockade with or as with a cordon (usually fol. by off )

The police cordoned off the street.