The term 'Amphitheater Level' is used to describe a type of seating arrangement in an auditorium or theater. It is characterized by a series of stepped tiers that form a semicircle around the stage. The crossword solution for this term is TIER, which is a four-letter word meaning a level or layer. This term is often used to describe the different levels of seating in an amphitheater, where each TIER is slightly higher than the one before it.