This is the 5327th most frequent Spanish word.
libanés
Lebanese.
The term 'libanesa' functions as an adjective agreeing with 'historia' (a feminine noun) to describe it as being related to Lebanon.
Mi amiga tiene un libro sobre la historia libanesa.
My friend has a book about Lebanese history.
The word 'libanés' is used as an adjective to describe a person's nationality, meaning 'Lebanese'.
Él es un profesor libanés que enseña en el colegio local.
He is a Lebanese teacher who teaches at the local school.
The word 'libaneses' is used here as an adjective describing dishes, referring to food that is typical of Lebanon.