قَاضٍ

Qāḍī (قاضٍ) derives from the Arabic root q-ḍ-y (ق-ض-ي), which carries the meaning of completing, settling, fulfilling — coming to a definitive conclusion. A qāḍī is literally one who decides, one who brings a matter to its final resolution. The root appears in the Quran in contexts ranging from divine decree to the completion of obligations, and its legal application as 'judge who pronounces a binding decision' was established in the earliest decades of the Islamic caliphate.

The qāḍī was a distinctly Islamic institution, appointed by the caliph or later by provincial governors to adjudicate disputes according to the shari'a. Unlike Roman or European judges who applied state-made law, the qāḍī was expected to derive rulings from the Quran, the hadith (traditions of the Prophet), ijma' (scholarly consensus), and qiyas (analogical reasoning). The qāḍī was therefore simultaneously a jurist and a scholar, required to possess mastery of the religious sciences as the precondition for legal authority.

The qāḍī's jurisdiction was broad: family law, inheritance, commercial contracts, endowments known as waqf, and criminal matters where penalties were prescribed by scripture. The qāḍī's court was theoretically open to all Muslims regardless of social standing, and in practice also handled disputes involving dhimmis (protected non-Muslim subjects) when they chose to submit to Islamic jurisdiction. The qāḍī kept registers of his decisions, and his judgments on matters of family status — births, marriages, divorces, deaths — served as the official record of the Muslim community.

The Umayyad and Abbasid caliphates exported the institution across the Islamic world, from Iberia to Central Asia. In al-Andalus, the Arabic qāḍī was absorbed into the Romance languages as alcalde — from the Arabic al-qāḍī with the definite article — which eventually came to mean a municipal official or mayor in Spanish. The word traveled from divine law to civic administration without anyone noticing the distance it had covered.