A prevention of access or exiting with an organized objective or purpose of stopping people or goods from leaving or going into a place: Using a blockade is usually done for military reasons, most often with ships, in order to isolate an area to prevent the importation of weapons or commercial materials to weaken an enemy.

To stop people or supplies from entering or leaving a port, a city, or other area; usually, during a war, so a country cannot build up its military forces with more soldiers and weapons: Military tanks and soldiers were blockading any possible entries to the enemy position that might be trying to take in new materials, ammunition, and reinforcements.