Meaning of VAPOR in English

I. va ‧ por /ˈveɪpə $ -ər/ BrE AmE noun [uncountable and countable]

[ Date: 1300-1400 ; Language: Old French ; Origin: vapeur , from Latin vapor 'steam, heat' ]

the American spelling of ↑ vapour

II. va ‧ pour BrE AmE British English , vapor American English /ˈveɪpə $ -ər/ noun

[uncountable and countable] a mass of very small drops of a liquid which float in the air, for example because the liquid has been heated ⇨ evaporation :

water vapour

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.