The ongoing progression of events; the fourth dimension

• The medium in which past, present, and future occur

A measurable duration or amount available

• A period needed or spent doing something

The current hour or moment shown by a clock

• A specific moment of a day

The suitable or scheduled moment for something

• The right moment to act

An era or period in history or in one's life

• A particular phase or age

An instance or occasion of an event

• One in a series of repeats

Tempo or meter in music; rhythmic pattern

• The measured duration of sounds

To measure or record duration, speed, or rate

• To choose or regulate when something happens

A referee's or official's call to pause or resume play

• A bartender's call that service is ending