understanding / jurisprudence / deep comprehension
Masculine noun (maṣdar). Verb: فَقِهَ (to understand deeply). Form V: تَفَقَّهَ (to study/seek deep understanding). فَقِيهٌ (jurist/scholar of fiqh).
Fiqh originally meant deep understanding of religion. It later became the technical term for Islamic jurisprudence - the science of deriving practical rulings from the Quran and Sunnah.