This is the 5457th most frequent Turkish word.
leri
"Leri" means "forward" or "ahead" in English.
Here, 'leri' is used as a possessive grammatical marker that indicates the plural form of 'ev', meaning 'houses', and the possessive suffix (possessive state of the following object 'kapıları'). It shows the doors belong to the houses.
Evlerin kapıları açık.
The doors of the houses are open.
In this sentence, 'leri' is a plural marker for 'öğrenci,' indicating the plural 'students'. It serves as the object of waiting.
Öğrencileri sınıfta bekliyorum.
I am waiting for the students in the classroom.
Here, 'leri' is a plural suffix attached to 'dağ,' indicating the plural form 'mountains'. It also takes the accusative case (including the accusative suffix 'ı').