Final answer:
A pirouette is the ballet term for a complete turn or multiple turns on one foot on demi-pointe.
Step-by-step explanation:
The ballet term that describes a complete turn or multiple turns of the body on one foot on demi-pointe (half-toe) is called a pirouette. This is a fundamental movement in classical ballet where the dancer spins around on one leg while the other leg is bent at the knee and held in a position such as passé (foot placed near the knee of the supporting leg). The success of a pirouette depends on proper body alignment, balance, and technique, and it can be performed either en dehors (outward, away from the supporting leg) or en dedans (inward, towards the supporting leg).