This is the 3495th most frequent Spanish word.
fijar
To fix, set, or establish.
In this sentence, 'fijar' is used in the sense of deciding and establishing a specific time for an event.
Voy a fijar la hora de la reunión para mañana.
I will set the time for the meeting for tomorrow.
Here, 'fijar' implies attaching or securing an object to a surface, ensuring it stays in place.
Puedes fijar el cuadro en la pared con estos clavos.
You can fix the painting on the wall with these nails.
In this instance, 'fijar' refers to concentrating an abstract concept like attention on a specific subject.