What is the meaning of blockade?

noun

• A war measure that isolates some area of importance to the enemy.
  • synonyms: encirclement
• Prevents access or progress.

verb

• Hinder or prevent the progress or accomplishment of.
  • usage: "His brother blocked him at every turn"
  • synonyms: obstruct, block, hinder, stymie, stymy, embarrass
• Render unsuitable for passage.
  • usage: "block the way"; "barricade the streets"; "stop the busy road"
  • synonyms: barricade, block, stop, block off, block up, bar
• Obstruct access to.
  • synonyms: block off
• Impose a blockade on.
  • synonyms: seal off