afternoon
The French word for afternoon is 'après-midi'. It is used to refer to the period of time between noon and evening. It is often used in phrases such as 'bon après-midi' (good afternoon) and 'après-midi pluvieux' (rainy afternoon).
I'm going to the movies this afternoon
The phrase uses the word 'après-midi' to indicate the period of the day in which the speaker is going to the movies.
The afternoon is the best time to do sports
This sentence is expressing a general opinion about the preferred time of day to do sports, using 'après-midi' to refer to the afternoon.
It's hot in the afternoon
In this sentence, 'après-midi' is used to refer to a part of the day in which the weather can be hot.