(ض) عَقَدَ يَعْقِدُ عَقْدًاʿaqada yaʿqidu ʿaqdan: (1) to tie something, to knot (2) to make something firm, to confirm, such as a promise or a bargain (transitive) (3) to be firm (intransitive). ﴿وَالَّذِيْنَ عَقَدَتْ اَيْمَانُكُمْ﴾ (An-Nisāʾ 4:33)
عُقْدَةٌʿuqdah pl. عُقَدٌʿuqad (noun, ism dhāt): a knot. ﴿وَاحْلُلْ عُقْدَةً مِّنْ لِّسَانِيْ﴾ (Ṭā Hā 20:27); ﴿وَمِنْ شَرِّ النَّفّٰثٰتِ فِي الْعُقَدِ﴾ (Al-Falaq 113:4)
عَقْدٌʿaqd pl. عُقُوْدٌʿuqūd (noun, ism dhāt): a covenant, a firm contract. ﴿يٰٓاَيُّهَا الَّذِيْنَ اٰمَنُوْٓا اَوْفُوْا بِالْعُقُوْدِ﴾ (Al-Māʾidah 5:1)
Form II (tafʿīl) عَقَّدَ يُعَقِّدُ تَعْقِيْدًاʿaqqada yuʿaqqidu taʿqīdan: to confirm repeatedly, to make thoroughly firm. ﴿بِمَا عَقَّدْتُّمُ الْاَيْمَانَ﴾ (Al-Māʾidah 5:89)
Form VII (infiʿāl) اِنْعَقَدَ يَنْعَقِدُ اِنْعِقَادًاinʿaqada yanʿaqidu inʿiqādan: (of a knot) to be tied; (of a gathering or agreement) to be convened or concluded (this verb is not used in the Quran).
Form VIII (iftiʿāl) اِعْتَقَدَ يَعْتَقِدُ اِعْتِقَادًاiʿtaqada yaʿtaqidu iʿtiqādan: to hold something firmly in the heart; to believe in it (this verb is not used in the Quran).