Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The isolation of a nation, area, city, or harbor by hostile ships or forces in order to prevent the entrance and exit of traffic and commerce.
  • n. The forces used to effect this isolation.
  • transitive v. To set up a blockade against. See Synonyms at besiege.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The physical blocking or surrounding of a place, especially a port, in order to prevent commerce and traffic in or out.
  • n. By extension, any form of formal isolation of something, especially with the force of law or arms.
  • n. The ships or other forces used to effect a naval blockade.
  • n. Preventing an opponent's pawn moving by placing a piece in front of it
  • v. To create a blockade against.

from the GNU version of the Collaborative International Dictionary of English

  • n. The shutting up of a place by troops or ships, with the purpose of preventing ingress or egress, or the reception of supplies.
  • n. An obstruction to passage.
  • n. interference with transmission of a physiological signal, or a physiological reaction.
  • transitive v. To shut up, as a town or fortress, by investing it with troops or vessels or war for the purpose of preventing ingress or egress, or the introduction of supplies. See note under blockade, n.
  • transitive v. Hence, to shut in so as to prevent egress.
  • transitive v. To obstruct entrance to or egress from.

from The Century Dictionary and Cyclopedia

  • n. The shutting up of a place, particularly a port, harbor, or line of coast, by hostile ships or troops, so as to stop all ingress or egress, and to hinder the entrance of supplies of provisions, ammunition, or reinforcements.
  • n. Hence A hindrance to progress or action caused by obstructions of any kind.
  • To subject to a blockade; prevent ingress or egress from by warlike means.
  • Hence To shut in by obstacles of any kind; block; obstruct.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. obstruct access to
  • v. render unsuitable for passage
  • v. hinder or prevent the progress or accomplishment of
  • n. a war measure that isolates some area of importance to the enemy
  • n. prevents access or progress
  • v. impose a blockade on

Etymologies

Probably block + -ade (as in barricade).
(American Heritage® Dictionary of the English Language, Fourth Edition)
block +‎ -ade (Wiktionary)

Examples

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