عِدَةٌ is the verbal noun for a promise, from root و ع د. Its written form lacks the initial wāw.
The text explains that its wāw was omitted by analogy with the imperfect and that a final tāʾ marbūṭah (ة) was added in compensation for the loss.
Thus وَعَدَ — يَعِدُ — عِدَةً looks different across perfect, imperfect and verbal noun, while retaining one underlying root and sense.
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The Verbal Noun عِدَةٌ
Weak-Initial Roots: Elision, Substitution, Assimilation and Short Paradigms
عِدَةٌ is the verbal noun for a promise, from root و ع د. Its written form lacks the initial wāw.
The text explains that its wāw was omitted by analogy with the imperfect and that a final tāʾ marbūṭah (ة) was added in compensation for the loss.
Thus وَعَدَ — يَعِدُ — عِدَةً looks different across perfect, imperfect and verbal noun, while retaining one underlying root and sense.