- Precipitation Pre*cip`i*ta"tion, n. [L. praecipitatio: cf. F.
1. The act of precipitating, or the state of being
precipitated, or thrown headlong.
Note: Deposits of dew, fog, and frost are not regarded by the United States Weather Bureau as precipitation. Sleet and snow are melted, and the record of precipitation shows the depth of the horizontal layers of water in hundredths of an inch or in millimeters. [Webster 1913 Suppl.]
The Collaborative International Dictionary of English. 2000.