الْقَصْرُ الْإِضَافِيُّ
Restriction relative to a particular comparison.
In relative qasr, the assertion responds to an assumed belief, a mistaken alternative, or a decision the listener has not made. For that reason an identical restricted sentence may function as ifrād, qalb, or taʿyīn in different conversations.
These categories describe how the statement relates to the listener’s prior position, not three fixed spellings of a restricted sentence. Classifying them requires identifying the belief or uncertainty being addressed.