Time Measurement Unit

Units for measuring time

half-hour

 NOUN

a period of 30 minutes

hour

 NOUN

a period of time that consists of 60 minutes. 30 minutes is usually called half an hour, 15 minutes can be called a quarter of an hour,and 45 minutes can be called three-quarters of an hour

hr

 ABBREVIATION

hour

m

 ABBREVIATION

minute

microsecond

 NOUN

a unit for measuring time. There are one million microseconds in a second.

millisecond

 NOUN

a unit for measuring extremely short periods of time. There are 1000 milliseconds in a second.

min.

 ABBREVIATION

minute

minute

 NOUN

a period of 60 seconds. There are 60 minutes in one hour

nanosecond

 NOUN

a unit for measuring time. There are one billion (=one thousand million) nanoseconds in a second.

s

 ABBREVIATION

second

sec.

 ABBREVIATION

seconds

second

 NOUN

an extremely short period of time that is one of the 60 parts in a minute