The term SNOWFALL UNIT is composed of two crossword solutions, INCH and FLAKE. An INCH is a unit of length in the imperial and US customary systems of measurement, equal to 1/12 of a foot or 2.54 centimeters. A FLAKE is a small particle or fragment of something, such as snow, which falls from the sky. Snowfall is the amount of snow that falls in a given area over a period of time. Therefore, the term SNOWFALL UNIT can be used to refer to the amount of snow that falls in a given area, measured in inches or flakes.