1799, noun of action from vaporize. In same sense Middle English had vaporacioun (late 14c.).
vaporization va·por·i·za·tion (vā'pə-rĭ-zā'shən)
n.
The conversion of a solid or liquid into a vapor.
Therapeutic application of a vapor.
In physics and chemistry, the conversion of a solid or a liquid into a gas. (See boiling point, phases of matter, and sublimation.)