a musical composition of several movements only loosely connected
"The conductor paused to explain that their latest program featured a suite, a collection of dances from different eras stitched together without a strict narrative thread."
a matching set of furniture
"She carefully arranged every piece in her living room to ensure the new sofa, chairs, and rug formed a cohesive suite that matched perfectly."
A retinue or company of attendants, as of a distinguished personage
"The king arrived not alone, but surrounded by his entire suite of loyal guards and courtiers."
In plain English: A suite is a group of rooms connected together, usually in a hotel or an office building.
"The hotel suite included a comfortable living room and two bedrooms."
Usage: In modern everyday English, use suite to refer to a set of connected rooms in a building rather than an entourage. Do not confuse it with the verb phrase "to suit," which means to be appropriate for something.
The word suite comes from the Middle French term suite, which originally meant a following or train of attendants. It entered English with this sense of accompaniment before later developing its modern meaning for a set of connected rooms.