«وَهُوَ أَنْ لَا يَرْوِيَهُ أَقَلُّ مِنَ اثْنَيْنِ عَنْ أَقَلِّ مِنَ اثْنَيْنِ»
An aziz report is one whose transmission does not fall below two transmitters at the relevant levels.
The name aziz has been connected to rarity and to a report gaining strength through a second route. Those linguistic associations help explain the label, but the technical definition depends on the actual pattern of transmission.
Imagine two Companions narrating a report, with at least two relevant transmitters from each and no solitary bottleneck anywhere in its routes. This illustrates an aziz structure. The separate question of each narrator’s reliability remains to be assessed.