This is the 513th most frequent Spanish word.
después
"Después" means "after" or "later" in English.
In this sentence, 'después' is used as a preposition indicating the timing of an action that happens after another specific event, which is 'almuerzo' (lunch).
Después del almuerzo voy a caminar.
After lunch, I am going to walk.
Here, 'después' functions as an adverb expressing a subsequent time without a specified context, equivalent to 'later' in English.
Nos veremos después.
We will see each other later.
In this construction, 'después de que' introduces a subordinate clause that indicates the timing relationship between two actions.