The term 'PUMP MEAS.' is an abbreviation for 'Pump Measurement'. Pump Measurement is the process of measuring the performance of a pump, which is a device used to move fluids or gases from one place to another. The crossword solutions for this term are GAL (3 letters) and GALS (4 letters). GAL stands for Gallon, which is a unit of measurement for volume, while GALS stands for Gallons, which is the plural form of the same unit of measurement.