No entry in Lane's Arabic-English Lexicon for the root ط م أ ن. Lane (d. 1876) died before completing the lexicon, and its later volumes are thin or absent — this root falls in that gap. Its absence here means only that Lane has no article for it, not that it has no meaning.
The roots that most often share a verse with ط م أ ن. Window: the verse. Measure: the number of distinct verses in which both roots occur (of the 12 this root appears in). Ubiquitous roots are excluded so genuinely connected concepts surface — see the method.
Page 1 of 1. The root is highlighted in each verse.
وَإِذْقَالَإِبْرَٰهِـۧمُرَبِّأَرِنِىكَيْفَتُحْىِٱلْمَوْتَىٰقَالَأَوَلَمْتُؤْمِنقَالَبَلَىٰوَلَٰكِنلِّيَطْمَئِنَّقَلْبِىقَالَفَخُذْأَرْبَعَةًمِّنَٱلطَّيْرِفَصُرْهُنَّإِلَيْكَثُمَّٱجْعَلْعَلَىٰكُلِّجَبَلٍمِّنْهُنَّجُزْءًاثُمَّٱدْعُهُنَّيَأْتِينَكَسَعْيًاوَٱعْلَمْأَنَّٱللَّهَعَزِيزٌحَكِيمٌ
Reference 2:260وَمَاجَعَلَهُٱللَّهُإِلَّابُشْرَىٰلَكُمْوَلِتَطْمَئِنَّقُلُوبُكُمبِهِۦوَمَاٱلنَّصْرُإِلَّامِنْعِندِٱللَّهِٱلْعَزِيزِٱلْحَكِيمِ
Reference 3:126فَإِذَاقَضَيْتُمُٱلصَّلَوٰةَفَٱذْكُرُوا۟ٱللَّهَقِيَٰمًاوَقُعُودًاوَعَلَىٰجُنُوبِكُمْفَإِذَاٱطْمَأْنَنتُمْفَأَقِيمُوا۟ٱلصَّلَوٰةَإِنَّٱلصَّلَوٰةَكَانَتْعَلَىٱلْمُؤْمِنِينَكِتَٰبًامَّوْقُوتًا
Reference 4:103قَالُوا۟نُرِيدُأَننَّأْكُلَمِنْهَاوَتَطْمَئِنَّقُلُوبُنَاوَنَعْلَمَأَنقَدْصَدَقْتَنَاوَنَكُونَعَلَيْهَامِنَٱلشَّٰهِدِينَ
Reference 5:113وَمَاجَعَلَهُٱللَّهُإِلَّابُشْرَىٰوَلِتَطْمَئِنَّبِهِۦقُلُوبُكُمْوَمَاٱلنَّصْرُإِلَّامِنْعِندِٱللَّهِإِنَّٱللَّهَعَزِيزٌحَكِيمٌ
Reference 8:10إِنَّٱلَّذِينَلَايَرْجُونَلِقَآءَنَاوَرَضُوا۟بِٱلْحَيَوٰةِٱلدُّنْيَاوَٱطْمَأَنُّوا۟بِهَاوَٱلَّذِينَهُمْعَنْءَايَٰتِنَاغَٰفِلُونَ
Reference 10:7ٱلَّذِينَءَامَنُوا۟وَتَطْمَئِنُّقُلُوبُهُمبِذِكْرِٱللَّهِأَلَابِذِكْرِٱللَّهِتَطْمَئِنُّٱلْقُلُوبُ
Reference 13:28مَنكَفَرَبِٱللَّهِمِنۢبَعْدِإِيمَٰنِهِۦٓإِلَّامَنْأُكْرِهَوَقَلْبُهُۥمُطْمَئِنٌّۢبِٱلْإِيمَٰنِوَلَٰكِنمَّنشَرَحَبِٱلْكُفْرِصَدْرًافَعَلَيْهِمْغَضَبٌمِّنَٱللَّهِوَلَهُمْعَذَابٌعَظِيمٌ
Reference 16:106وَضَرَبَٱللَّهُمَثَلًاقَرْيَةًكَانَتْءَامِنَةًمُّطْمَئِنَّةًيَأْتِيهَارِزْقُهَارَغَدًامِّنكُلِّمَكَانٍفَكَفَرَتْبِأَنْعُمِٱللَّهِفَأَذَٰقَهَاٱللَّهُلِبَاسَٱلْجُوعِوَٱلْخَوْفِبِمَاكَانُوا۟يَصْنَعُونَ
Reference 16:112قُللَّوْكَانَفِىٱلْأَرْضِمَلَٰٓئِكَةٌيَمْشُونَمُطْمَئِنِّينَلَنَزَّلْنَاعَلَيْهِممِّنَٱلسَّمَآءِمَلَكًارَّسُولًا
Reference 17:95وَمِنَٱلنَّاسِمَنيَعْبُدُٱللَّهَعَلَىٰحَرْفٍفَإِنْأَصَابَهُۥخَيْرٌٱطْمَأَنَّبِهِۦوَإِنْأَصَابَتْهُفِتْنَةٌٱنقَلَبَعَلَىٰوَجْهِهِۦخَسِرَٱلدُّنْيَاوَٱلْـَٔاخِرَةَذَٰلِكَهُوَٱلْخُسْرَانُٱلْمُبِينُ
Reference 22:11يَٰٓأَيَّتُهَاٱلنَّفْسُٱلْمُطْمَئِنَّةُ
Reference 89:27No published investigation cites this root yet. When one does, it appears here — the evidence links back to the argument.