Vocalization of Arabic words, especially of the last vowel which depends on its function and position in the sentence.

Example: Placing the “-u” at the end of waladu in ذَهَبَ الوَلَدُ إلى اللْبَيْتِ  (dhahaba al-waladu ila al-beiti) because it is the subject of the sentence is called ḍabṭ.