1a line or circle of police, soldiers, or guards preventing access to or from an area or building:the crowd was halted in front of the police cordon
2a fruit tree trained to grow as a single stem.
3 Architecture a projecting course of brick or stone on the face of a wall.
[with object] (cordon something off)
prevent access to or from an area or building by surrounding it with police or other guards:the city centre was cordoned off after fires were discovered in two stores
late Middle English (denoting an ornamental braid): from Italian cordone, augmentative of corda, and French cordon, diminutive of corde, both from Latin chorda 'string, rope' (see cord). sense 3 of the noun, the earliest of the current noun senses, dates from the early 18th century