Obs. Also 4–6 -acion, 6 -acyon, 5 vapouracioun. [ad. L. vapōrātio, n. of action f. vapōrāre: see prec. Cf. Sp. vaporacion, It. -azione.] The action of vaporizing; conversion into, production of, vapor.
1398. Trevisa, Barth. De P. R., XII. xxi. (Bodl. MS.). Also of vaporacion of fumosite þat he [sc. the sea] casteþ vpward and bredeþ myste and cloudes.
1456. Sir G. Haye, Gov. Princes, Wks. (S.T.S.), II. 118. Tendar metis of licht and sone degestioun, and delicious thingis and of sutil vapouracioun moystis.
1528. Paynell, Salerne’s Regim., d ij b. Blud lettyng … minisheth vaporation that gothe to the heed & troublethe the wyttis.
1561. Hollybush, Hom. Apoth., 35. Make a vaporacion beneth with Rammes greace, or fat, waxe, pitche and cumin.
1623. Cockeram, I. Vaporation, a casting forth of vapours.
1651. French, Distill., i. 9. It may be done … by Corosion, By Fumigation or Vaporation.
1720. S. Parker, Bibliotheca Biblica, I. 438. By Conflagration, and Congelation,… by Vaporation, and Evaporation: by Sublimation, and Precipitation.
