In plain terms
Qasr
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Qasr is shortening the four-unit obligatory prayers to two units, a concession available to a traveler. It applies only to the four-rakah prayers; dawn and sunset prayers are not shortened. It is often discussed alongside the separate concession of combining two prayers together.
Related terms
Salah
Salah is the ritual prayer performed by Muslims: a fixed sequence of standing, bowing, and prostration, with set recitation at each stage. Five are obligatory each day, at set…
Rakah
A rakah is one complete unit of salah, the ritual prayer — a cycle of standing, bowing, and two prostrations, with set recitation. Each of the five daily prayers has a fixed…