فصل doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• فَصَلَ Form 1

  1 فَصَلَ ذ , (S, M, O, Msb, K,) aor. فَصِلَ , inf. n. فَصْلٌ, (M, Msb, K,) He separated, or divided, (S, O, Msb, K,) and put apart, (Msb,) a thing, (S, O, Msb, *) عَنْ غَيْرِهِ [from another thing], (Msb,) and بَعْضَهُ م…

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• فصّل Form 2

  2 فصّل النَّظْمَ ذ , (M, TA,) thus correctly, with teshdeed, bat in the K فَصَلَ, like نَصَرَ, (TA,) [inf. n. تَفْصِيلٌ,] He put between every two of the strung beads [or pearls] a bead such as is termed فَاصِلَةٌ [q. v.…

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• فَصْلٌ

  فَصْلٌ ذ inf. n. of the trans. v. فَصَلَ [q. v. passim]. (M, Msb, K, TA.) [As a simple subst., it has various significations here following: and is] sing. of فُصُولٌ. (S, O.) -b2- A separation, division, or partition, be…

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