مُنْصَرِفٌ: وَهُوَ مَا لَيْسَ فِيهِ سَبَبَانِ، أَوْ وَاحِدٌ يَقُومُ مَقَامَهُمَا مِنَ الْأَسْبَابِ التِّسْعَةِ، كَزَيْدٍ، وَيُسَمَّى الِاسْمَ الْمُتَمَكِّنَ.
Translation: A munṣarif is a noun in which neither two of the nine causes, nor one cause equivalent to two, is present—for example, Zayd. It is also called the ism mutamakkin.
In practical terms, where there is no effective cause preventing full declension, the noun normally takes its regular case vowels and tanwīn.