The noun breakdown has 4 senses (first 1 from tagged texts)
1. (5) dislocation, breakdown -- (the act of disrupting an established order so it fails to continue; "the social dislocations resulting from government policies"; "his warning came after the breakdown of talks in London")
2. breakdown, crack-up -- (a mental or physical breakdown)
3. breakdown, equipment failure -- (a cessation of normal operation; "there was a power breakdown")
4. breakdown, partitioning -- (an analysis into mutually exclusive categories)