This is the 13815th most frequent Turkish word.
ler
The suffix "-ler" in Turkish indicates plural for nouns and third-person plural for verbs.
Here, 'ler' is used as a plural suffix for 'kitap' (book), making it 'kitaplar' (books).
Kitaplar masanın üzerindedir.
The books are on the table.
In this sentence, 'lerle' combines the plural suffix 'ler' for 'öğretmen' (teacher) and the instrumental case ending '-le' (with), forming 'öğretmenlerle' (with the teachers).
Yeni öğretmenlerle tanıştık.
We met with the new teachers.
Here, 'ler' adds the plural meaning to 'ağaç' (tree), making it 'ağaçlar' (trees).