What is the meaning of blockage?

noun

• The physical condition of blocking or filling a passage with an obstruction.
  • synonyms: obstruction
• An obstruction in a pipe or tube.
  • usage: "we had to call a plumber to clear out the blockage in the drainpipe"
  • synonyms: block, closure, occlusion, stop, stoppage
• The act of blocking.
  • synonyms: closure, occlusion