(ن) كَتَبَ يَكْتُبُ كَتْبًا وَكِتَابَةًkataba yaktubu katban wa-kitābatan: the original meaning is to join and to stitch (كَتَبَ السِّقَآءَkataba as-siqāʾa: to sew up a waterskin); to write, by analogy with the joining of letters; then to make binding, to prescribe. ﴿كُتِبَ عَلَيْكُمُ الصِّيَامُ﴾ (Al-Baqarah 2:183); ﴿وَلْيَكْتُبْ بَّيْنَكُمْ كَاتِبٌۢ بِالْعَدْلِ﴾ (Al-Baqarah 2:282)
كِتَابٌkitāb pl. كُتُبٌkutub (noun, ism dhāt): a written thing, a book; also a prescribed decree. ﴿ذٰلِكَ الْكِتٰبُ لَا رَيْبَ فِيْهِ﴾ (Al-Baqarah 2:2)
كَاتِبٌkātib pl. كٰتِبُوْنَkātibūna (active participle, ism fāʿil): a writer, a scribe. ﴿كِرَامًا كَاتِبِيْنَ﴾ (Al-Infiṭār 82:11)
مَكْتُوْبٌmaktūb (passive participle, ism mafʿūl): written. ﴿يَجِدُوْنَهُۥ مَكْتُوْبًا عِنْدَهُمْ﴾ (Al-Aʿrāf 7:157)
Form III (mufāʿalah) كَاتَبَ يُكَاتِبُ مُكَاتَبَةًkātaba yukātibu mukātabatan: to make a written contract of emancipation with a slave (for a consideration). ﴿فَكَاتِبُوْهُمْ اِنْ عَلِمْتُمْ فِيْهِمْ خَيْرًا﴾ (An-Nūr 24:33)
Form VIII (iftiʿāl) اِكْتَتَبَ يَكْتَتِبُ اِكْتِتَابًاiktataba yaktatibu iktitāban: to have something carefully written down, to have it copied. ﴿اَسَاطِيْرُ الْاَوَّلِيْنَ اكْتَتَبَهَا﴾ (Al-Furqān 25:5)