Discover the meaning of the term Al-tdakhl (تداخل) in Islamic vocabulary.
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Updated on 11 April 2026 at 1:05 AM
📖 2 min readIt is the entry of one thing into another without increase of volume or magnitude.
(In Persian: darikdikar dar-amadan). In the usage of the wise: the permeation of things into one another such that they unite in position and volume. In another formulation: the entry of a thing into another without increase of volume or magnitude. Now position denotes the sensible affection; then, in their view, interpenetration in substances is invalid, unlike accidents, as set out in the books of wisdom.
The entry of a thing into a thing without increase of volume or magnitude. The tadakhul of two numbers: the lesser of them sufficing for the greater, as three and nine. (Al-Misbah al-Munir, root dakhala, p. 190; al-Tawqif, p. 166; al-Ta'rifat, p. 46).
The meeting of a thing with another in its entirety, until one place suffices for both.
The entry of a thing into a thing without increase of volume or magnitude (al-Ta'rifat, p. 56). The tadakhul of two numbers: the lesser annulling the greater, as three and nine.
The mingling of things with one another (interference). The tadakhul of two numbers: the greater of the two admitting division by the lesser without remainder.