(ض) فَصَلَ يَفْصِلُfaṣala yafṣilu: (1) (transitive) فَصْلًاfaṣlan: to separate two things; to decide, to give judgement (2) (intransitive) فُصُوْلًاfuṣūlan: to leave a town, to set out. ﴿فَلَمَّا فَصَلَ طَالُوْتُ بِالْجُنُوْدِ﴾ (Al-Baqarah 2:249)
فَصْلٌfaṣl (verbal noun, maṣdar, also used as an adjective): decisive, one who gives a clear-cut judgement; «يَوْمُ الْفَصْلِyawmu al-faṣl»: the Day of Decision. ﴿اِنَّهُۥ لَقَوْلٌ فَصْلٌ﴾ (Aṭ-Ṭāriq 86:13)
فَصِيْلَةٌfaṣīlah: kin, close family (from whom a man has separated and gone forth). ﴿وَفَصِيْلَتِهِ الَّتِيْ تُـْٔوِيْهِ﴾ (Al-Maʿārij 70:13)
Form II (tafʿīl) فَصَّلَ يُفَصِّلُ تَفْصِيْلًاfaṣṣala yufaṣṣilu tafṣīlan: to separate the parts of a thing one from another, to set forth in detail. ﴿كِتٰبٌ فُصِّلَتْ اٰيٰتُهُۥ﴾ (Fuṣṣilat 41:3)
Form III (mufāʿalah) فَاصَلَ يُفَاصِلُ فِصَالًاfāṣala yufāṣilu fiṣālan: to separate someone from a partnership; to wean a child. ﴿وَفِصٰلُهُۥ فِيْ عَامَيْنِ﴾ (Luqmān 31:14)