Maddah definitions

In the Qur'an, it indicates an extra long vowel and can appear over any long vowel.
noun
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Arabic diacritic similar in appearance to a tilde. Over an alif (آ "alif maddah"), it indicates glottal stop, /ʔ/, followed by a long /aː/. The diacritic is not used separately, only over alif. Alif maddah can appear in the beginning: آسف (ʾāsif) or in the middle of a word: قرآن (qurʾān).
noun
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In Persian the letter is used only in the beginning of a word with a long /aː/: آمدن (âmadan)
noun
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Origin of maddah

From Arabic مَدَّةٌ (madda).