This is the 77th most frequent Portuguese word.
sempre
Always.
Here, 'sempre' is used as an adverb indicating frequency, meaning 'always'.
Eu sempre bebo café pela manhã.
I always drink coffee in the morning.
Here, 'sempre' is used to mean 'forever', indicating a continuous and indefinite duration in time.
Você pode contar comigo, estarei ao seu lado para sempre.
You can count on me, I will be by your side forever.
Here, 'sempre' is again used as an adverb of frequency, signifying a consistent and regular habit.