Definition of munqaṭi’
According to Ibn Abd al-Barr,[1] munqaṭi’[2] is anything which is not connected i.e. any narration having a drop of narrators in the isnad. Therefore, according to Ibn Abd al-Barr mu’allaq, mursal and mu’ḍal are all forms of munqaṭi’.
According to al-Ḥākim,[3] munqaṭi’ is an unknown narrator, or a drop of one or more narrators before the tabi’ee. This is different from mursal according to him.
According to Ibn Ḥājar and Suyuṭī[4] munqaṭi is a drop of one or more narrators before the ṣaḥābah, with the condition that it is not continuous. Therefore, this is different from both mursal and mu’ḍal according to them.
Mursal and munqaṭi are the same according to the Mutaqaddimīn
These are the definitions given by the muta`akhirīn muḥaddithīn__ (ḥadīth scholars of the latter generations) from the time of Ḥākim. As for the mutaqaddimīn muḥaddithīn (ḥadīth scholars from the earlier generations),[5] as well as the fuqaḥā and usūliyyīn, mursal and munqaṭi are considered to be the same.
[1] And Khatīb al-Baghdādī
[2] Literally; disconnected.
[3] And the mutaqaddimīn
[4] And Allamah ‘Irāqī
[5] Such as Ibn Ḥājar and Nawāwi