compartment

Etymology

First attested 1564, from Middle French compartiment, from Italian compartimento, from Late Latin compartiri (“to divide with, to share with”), from com- + partiri (“to apportion, to divide, to share”).

noun

1. A room, or section, or chamber
   Two men were seated in a well-lit compartment of a third-class railway carriage.
   This is a second-class ticket. And you're sitting in the first class!” “I'd no idea,” Haldiram said. “I didn't know what compartment was this.” And looking around, he asked, “Where does it say First Class? I still can't see it. 2014-04-28, Dr. Ulhas R. Gunjal, Home, Again!: A Novel of Identity, Self-Discovery, and Tragedy, AuthorHouse, →OCLC, page 313
2. One of the parts into which an area is subdivided.
3. (biochemistry) Part of a protein that serves a specific function.
4. (heraldry) A mound (often of grass), shelf (of e.g. wall) or other thing beneath the shield in a coat of arms on which the supporters stand.
5. (anatomy) A region in the body, delimited by a biological membrane.

verb

1. (transitive) To arrange in separate compartments.