Definition of "Gauge" :
noun: a measuring instrument for measuring and indicating a quantity such as the thickness of wire or the amount of rain etc.
noun: diameter of a tube or gun barrel
noun: the thickness of wire
noun: the distance between the rails of a railway or between the wheels of a train
noun: accepted or approved instance or example of a quantity or quality against which others are judged or measured or compared
verb: mix in specific proportions
verb: adapt to a specified measurement
"Gauge the instruments."
verb: measure precisely and against a standard
"The wire is gauged."
verb: judge tentatively or form an estimate of (quantities or time)
verb: determine the capacity, volume, or contents of by measurement and calculation
"Gauge the wine barrels."
verb: rub to a uniform size