Plain English Meaning
A second stall that happens right after recovering from the first one, usually because the pilot pulled up too hard or too soon and forced the wing back into a stall before it was ready.
Full Definition
A stall that occurs after an initial stall recovery, typically because the pilot attempted to return to the original flightpath too quickly or applied excessive back pressure on the elevator before the wing had fully regained smooth airflow and adequate flying speed.
Context Anchor
Encountered in stall recovery training, especially when practicing how to recover without pulling back too aggressively after the first stall.
Derivation
Secondary comes from the Latin secundarius, meaning 'of the second order' or 'following.' Here it simply means a stall that follows the first one — a second stall caused by the recovery itself.