وَفَائِدَةُ هَذِهِ الْإِضَافَةِ: تَعْرِيفُ الْمُضَافِ إِنْ أُضِيفَ إِلَى مَعْرِفَةٍ كَمَا مَرَّ.
Translation: One benefit of this iḍāfah is that the mudāf becomes definite when attached to a definite noun.
غُلَامٌ: an unspecified servant, indefinite.
غُلَامُ زَيْدٍ: Zayd’s servant; Zayd is a definite proper name, so the construct identifies which servant is meant.
This is a semantic effect of the construction, not merely the loss of tanwīn.
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Al-Majrūrāt — Semantic and Formal Iḍāfah
وَفَائِدَةُ هَذِهِ الْإِضَافَةِ: تَعْرِيفُ الْمُضَافِ إِنْ أُضِيفَ إِلَى مَعْرِفَةٍ كَمَا مَرَّ.
Translation: One benefit of this iḍāfah is that the mudāf becomes definite when attached to a definite noun.
غُلَامٌ: an unspecified servant, indefinite.
غُلَامُ زَيْدٍ: Zayd’s servant; Zayd is a definite proper name, so the construct identifies which servant is meant.
This is a semantic effect of the construction, not merely the loss of tanwīn.