Noun breakdown has 4 senses
  1. 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"
    --1 is a kind of disruption, perturbation
    Derived form: verb break down2
  2. breakdown, crack-up - a mental or physical breakdown
    --2 is a kind of collapse
    --2 has particulars: nervous breakdown
    Derived forms: verb break down3, verb break down8
  3. breakdown, equipment failure - a cessation of normal operation; "there was a power breakdown"
    --3 is a kind of failure
    --3 has particulars:
     brake failure; engine failure; misfire, dud; outage; power outage, power failure; fault
    Derived form: verb break down4
  4. breakdown, partitioning - an analysis into mutually exclusive categories
    --4 is a kind of analysis, analytic thinking
    --4 has particulars: resolution, resolving
    Derived form: verb break down1