noun
- a fall or shower of rain.
- the amount of water falling in rain, snow, etc., within a given time and area, usually expressed as a hypothetical depth of coverage: a rainfall of 70 inches a year.
noun
- precipitation in the form of raindrops
- meteorol the amount of precipitation in a specified place and time
also rain-fall, “amount of precipitation that falls as rain,” 1839, from rain (n.) + fall (n.).
- The quantity of water, usually expressed in millimeters or inches, that is precipitated in liquid form in a specified area and time interval. Rainfall is often considered to include solid precipitation such as snow, hail, and sleet as well.