Which term describes a passage for the entire ensemble?

The term that describes a passage for the entire ensemble is "tutti." In musical terminology, "tutti" indicates that all musicians or singers are to perform together, as opposed to solo sections where individuals showcase their talents. This term is often used in orchestral and choral contexts to ensure that the full complement of instruments or voices contributes to the musical texture.

In contrast, "solo" refers to a passage performed by a single musician, highlighting the individual's abilities. "Duo" is a term for a performance involving two musicians, which also doesn't encompass the full ensemble. "Quintet" specifies a group of five musicians, making it clear that it represents only a portion of a larger ensemble rather than the whole. Therefore, "tutti" effectively captures the concept of collective performance across the entire group.