Definition:

1. A substance in the gaseous state that is normally in the form of a solid or liquid 2. Any visible diffused substance floating in the atmosphere and impairing its transparency 3. Wind; flatulence 4. Something unsubstantial or fleeting 5. A disease of nervous debility, in which a variety of strange images float in the brain; depression of spirit 6. To pass off in fumes; to evaporate 7. To boast or vaunt with a vain display of worth; to boast

Alternate Spellings and Forms:

vapor, vapours, vapors