Minute definition: the sixtieth part (1/60) of an hour; sixty seconds.. See examples of MINUTE used in a sentence. An hour is a unit of time equal to 60 minutes, or 3,600 seconds. A minute is a customary unit of time. It is equal to 60 seconds. There are 60 minutes in an hour. Unlike the second, the minute is not an SI unit. A minute is also of a degree. In this context, a minute is also called an arcminute, and is written with the symbol. [1][2] For example, the Sun and Moon both have angular diameters of about 30 arcminutes—when seen from Earth. [3] MINUTE definition: 1. one of the 60 parts that an hour is divided into, consisting of 60 seconds: 2. used in spoken…. Learn more.