An instrument or device for measuring the magnitude, amount, or contents of something, typically with a visual display of such information. The fuel gauge on the dashboard showed that the tank was almost empty.
A standard or scale of measurement. The gauge of the wire determines its electrical resistance.
The thickness, size, or capacity of something, especially as a standard measure. The gauge of the shotgun is an important factor in its performance.
A means of estimating or judging something. Public opinion can be a useful gauge of the effectiveness of government policies.
The distance between the inner sides of the rails on a railway track. The railway uses a narrow gauge to navigate the mountainous terrain.