This is the 442nd most frequent Catalan word.
sentir
To feel; to hear.
In this sentence, 'sentir' is used to mean 'to hear'.
Puc sentir el vent quan obro la finestra.
I can hear the wind when I open the window.
Here, 'sentir' expresses the meaning of 'to feel' an emotion.
Ella sent una gran alegria pel seu èxit.
She feels great joy for her success.
'Sento' in this context again means 'to hear', specifically describing being unable to perceive a sound.