ذهنStrength, specified in the mind as retentive sharpness — understanding and memory. (root dhhn)

The lexicographers in chronological order, from al-Khalīl to Lane.

Al-Khalīl defines al-dhihn simply as ḥifẓ al-qalb, 'the heart's retention,' giving the usage 'ijʿal dhihnaka ilā kadhā' ('turn your mind to such-and-such'). Al-Jawharī adds fiṭna ('perspicacity') alongside ḥifẓ, and reports dhihn also meaning quwwa ('strength, vigour'), citing Aws b. Ḥajar's line about a leg's 'dhihn' — its residual strength — showing the word's older, more physical sense. Ibn Fāris fixes the root's single aṣl as quwwa, from which fiṭna and ḥifẓ are treated as a specification onto the mind; 'mā bihi dhihn' means 'he has no strength left.' Ibn Manẓūr broadens the picture: dhihn = fahm wa ʿaql (understanding, intellect), plural adhhān, with a curious causative dhahhananī ('he made me forget, distracted me') running seemingly against the base sense, and dhāhana ('to outdo another in sharpness'). Lane's English distillation — 'intelligent, possessed of understanding, sagacious, endowed with a retentive mind' — closes the sequence with idioms like 'idhhan ilā mā aqūlu' ('understand what I say') and 'huwa lā yadhhanu shayʾan' ('he understands nothing').

What the theorists of sound symbolism would say of these letters. Speculative by nature.

Al-Dabbāgh reads dhāl (fatḥa) as marking 'the magnifying of that thing which the self has come to possess' — apt, speculatively, for a word whose oldest sense is a possessed strength. Hāʾ, assigned to the beginning of the world, is read by al-Dabbāgh as 'pure mercy with no end.' Nūn, the fourth heaven, is read as 'the good that dwells in the self, kindling within it' — a description that resonates loosely with dhihn as an inner faculty. These are patterns proposed within a specific mystical letter-theory (Ibn ʿArabī's Breath, al-Dabbāgh's letter meanings); mainstream historical linguistics gives them no evidentiary weight beyond the suggestive.

The two-letter nucleus (Ibn Fāris's own chapters) and the permutations of the letters (Ibn Jinnī).

The ذ-ه nucleus groups ذهب ('to go, to depart' — also 'gold,' via freshness/brightness), ذهل ('to be distracted or forget out of fright or preoccupation'), and ذهن ('strength,' specialized as mental retention). There is a suggestive tension within this family: ذهب and ذهل both name a kind of departing or slipping away (of oneself, of attention), while ذهن names precisely the power that resists such slippage — retentive strength. Among the six theoretical permutations of ذ-ه-ن, only ذهن itself is an attested Arabic word; ذنه, هذن, هنذ, نذه, and نهذ are all unattested, so there is no productive permutation set here for Ibn Jinnī's greater-derivation method to work on.

Cognates in the sister languages, and whether the word was borrowed.

No confident Semitic cognate for ذ-ه-ن has been identified. Hebrew and Aramaic have no attested ד-ה-ן / דהן root carrying a sense of 'strength' or 'mind,' and Akkadian, Gəʿəz, and Old South Arabian data offer nothing comparable. The word should be treated as an Arabic-internal formation, and there is no reason to suspect borrowing.

The word as a technical term in falsafa and theology.

Dhihn is a genuine technical term in Arabic logic and epistemology, standing for 'the mind' as the locus of al-wujūd al-dhihnī, mental or intelligible existence, contrasted with al-wujūd al-ʿaynī or al-khārijī, existence in the concrete extramental world. Avicenna's logical works use dhihn as the site where universal quiddities (māhiyyāt) subsist as concepts (maʿānī) without thereby existing externally, a distinction central to his theory of universals and later taken up in debates over 'second intentions' (al-maʿqūlāt al-thāniya). Al-Ghazālī and later mutakallimūn inherit and dispute this dhihnī/khārijī distinction in discussions of how God's knowledge and the reality of impossible or non-existent things can be 'known.' The term thus names not psychological faculty alone but a distinct mode of existence in later Islamic philosophy.

The word in Ibn ʿArabī's text and terminology.

The supplied Faṣṣ Ādam passage uses dhihn in exactly this falsafa-derived sense: a reality (al-māhiyya) that 'has no existence in its own concrete essence [ʿaynihā]' is nonetheless 'intelligible, known without doubt in the mind [dhihn]' — hidden, in that it never departs from mental existence. This places Ibn ʿArabī's usage squarely within the wujūd dhihnī / wujūd ʿaynī distinction inherited from falsafa, applied here to his broader doctrine that realities (the fixed entities, al-aʿyān al-thābita) are known and 'existent' in a qualified, intelligible sense prior to or apart from concrete manifestation. No formal Iṣṭilāḥ definition of dhihn from Ibn ʿArabī's own glossary is supplied in this dataset, so the reading rests on this passage's context rather than a lexicon entry.