ع ک فʿ-k-f
(ن، ض) عَكَفَ يَعْكُفُ وَيَعْكِفُ عُكُوْفًاʿakafa yaʿkufu wa-yaʿkifu ʿukūfan: (with تعظيمًاtʿẓyman) to remain devoted to something, to sit clinging to it; also to restrain, to confine.
عَاكِفٌʿākif pl. عٰكِفُوْنَʿākifūna (active participle, ism fāʿil). ﴿مَا هٰذِهِ التَّمَاثِيْلُ الَّتِيْٓ اَنْتُمْ لَهَا عٰكِفُوْنَ﴾ (Al-Anbiyāʾ 21:52); ﴿وَلَا تُبَاشِرُوْهُنَّ وَاَنْتُمْ عٰكِفُوْنَ فِي الْمَسٰجِدِ﴾ (Al-Baqarah 2:187)
مَعْكُوْفٌmaʿkūf (passive participle, ism mafʿūl): held back, detained. ﴿وَالْهَدْيَ مَعْكُوْفًا﴾ (Al-Fatḥ 48:25)
Form VIII (iftiʿāl) اِعْتَكَفَ يَعْتَكِفُ اِعْتِكَافًاiʿtakafa yaʿtakifu iʿtikāfan: to stay devotedly in a place, especially a mosque, with the intention of worship (this verb is not used in the Quran).