Time (noun)

1. The continuous sequence of events that occur in succession.
2. A point or period of time when a particular event occurs.
3. A duration of a specific length.
4. A suitable or convenient moment.
5. An instance of a clock or watch showing a particular hour or minute.

Origin:

Middle english, from old english tīma; akin to old high german zīt time.

Examples:

1. What time is it?
2. It's time for lunch.
3. I've been working on this for a long time.
4. I don't have much time left.
5. This is the first time I've been here.