(time) fifteen minutes.

The fixed block of time during which an employee is expected to be at work; excludes flexitime and leave.

A time of day, usually in the afternoon or early evening, when a bar or pub offers its drinks at a discounted price.

(figuratively) The hour at which any major event planned for the future is set to begin, as used in United States military.

(idiomatic) The times of the day when traffic jams are commonplace, due mainly to people commuting to or from work.

The very early morning, just after midnight, when most people are asleep.

The hand of a clock or watch face that revolves twice each day and indicates the hours.

The very early morning; the early morning hours; the nighttime hours following midnight, when most people are asleep.

(US) A period when traffic is light / time outside normal business hours

(Christianity) the hour of fasting and prayer before communion is to be taken. / (Ireland, informal) the hour between 2.30 pm and 3.30 pm that pubs formerly had to shut to comply with licencing laws.