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1. A state of depression
   - blues, blue devils, megrims, vapours [Brit, Cdn]

1. A visible suspension in the air of particles of some substance
   - vapour [Brit, Cdn]
    
2. The process of becoming a vapor
   - vaporization, vaporisation [Brit], vapour [Brit, Cdn], evaporation

See also: evaporate, vaporize, vaporous

Type of: depression, phase change, phase transition, physical change, state change, suspension

Encyclopedia: Vapor