an instrument for measuring the amount or level of something

a measurement of how wide or thick something is

a measurement of how wide the barrel of a gun is

the distance between the rails of a railway track or the wheels of a train

a narrow gauge railway

At that time railways of three different gauges were in use.

a fact or an event that can be used to estimate or judge something

Tomorrow's game against Arsenal will be a good gauge of their promotion chances.

to make a judgement about something, especially people’s feelings or attitudes

to measure something accurately using a special instrument

precision instruments that can gauge the diameter to a fraction of a millimetre

We were able to gauge the strength of the wind from the movement of the trees.

It is impossible to gauge the extent of the damage.

It is difficult to gauge how much fuel is needed

LEARNit Dictionary