This is the 13570th most frequent Turkish word.
kullanmasına
"To his/her/its use" or "for his/her/its using."
Here, 'kullanmasına' serves as the infinitive form 'to use' with a possessive construction indicating 'Ali's use', denoting permission.
Ali'nin bilgisayarı kullanmasına izin verildi.
Ali was allowed to use the computer.
In this sentence, 'kullanmasına' is used with a possessive suffix and a dative marker, indicating the purpose of use focusing on the individual's action.
Telefonu ne amaçla kullanmasına karar vereceğiz.
We will decide for what purpose he/she will use the phone.
Here, 'kullanmasına' expresses intention to grant the action of 'using' to everyone, with the possessive indicating collective use.