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vapor (EN)
noun

noun “vapor”

singular vapor us, vapour uk, plural vapors us, vapours uk or uncountable
  1. the gaseous form of a substance that is normally liquid or solid
    Water vapor condenses to form clouds in the sky.
  2. (figuratively) something that is insubstantial or quickly disappears; an illusion
    His promises were just vapor; nothing ever came of them.