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Meaning of compartmentation

com•part•men•ta•tion

Pronunciation: (kum-pärt"mun-tā'shun), [key]
— n. Naut.
  1. subdivision of a hull into spaces enclosed by watertight bulkheads and sometimes by watertight decks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.