The term "measure" has several meanings, depending on its context.
In general usage, a measure is something used to gauge or quantify something else; for example, measuring tape is used to determine the dimensions of an object. In this sense, measures can refer to any standard unit of measurement such as inches, meters, or pounds.
However, in other contexts, "measure" may also mean a specific action taken towards achieving a goal or managing something; for example, taking measures to ensure safety at workplace. It could also refer to the level of something, like someone's intelligence being measured by an IQ test.
In music, measure refers to a unit of rhythm that is divided into beats and typically consists of four bars or eight measures in a 4/4 time signature.