Afternoon refers to the time of day between noon and evening, typically from 12:00 p.m. to around 6:00 p.m.
The term can also be used as a greeting, as in "Good afternoon!" which is a polite way to say hello during this time period.
Other meanings of afternoon include:
1. The later period of something ("the afternoon of one's life")
2. In some contexts, it can refer to a light meal eaten in the afternoon (similar to "afternoon tea")
3. In meteorological terms, it may refer to specific weather patterns occurring in the afternoon hours