This is the 569th most frequent Swedish word.
först
"Först" means "first" in English.
In this sentence, "först" is used to indicate 'not until' with a reference to the earliest occasion something happens.
Jag kommer hem först imorgon.
I will arrive home not until tomorrow.
Here, "först" means 'first' as in the initial action in a sequence of events.
Först äter vi middag, sedan tittar vi på en film.
First, we will have dinner, then we will watch a movie.
In this sentence, "först" means 'first' indicating priority or sequence to completing a task.