Meaning "set of correlated principles, facts, ideas, etc." first recorded 1630s. Meaning "animal body as an organized whole, sum of the vital processes in an organism" is recorded from 1680s; hence figurative phrase to get (something) out of one's system (1900). Computer sense of "group of related programs" is recorded from 1963. All systems go (1962) is from U.S. space program. The system "prevailing social order" is from 1806.
library classification system that organizes information into 10 broad areas subdivided numerically into progressively smaller topics, by 1885, named for Melvil Dewey (1851-1931) who proposed it 1876 while acting librarian of Amherst College. He also crusaded for simplified spelling and the metric system.
late 14c., "pertaining to a household," from Anglo-French meignial, from Old French mesnie "household," earlier mesnede, from Vulgar Latin *mansionata, from Latin mansionem "dwelling" (see mansion). Compare Middle English meine "a household, household servants" (c. 1300; also "chessmen"), from Anglo-French meine, Old French maisniee. From early 15c. as "belonging to a retinue or train of servants." Sense of "lowly, humble, servile, suited to a servant" is recorded by 1670s.
also majordomo, "man employed to superintend a household, especially that of a sovereign or other dignitary," 1580s, via Italian maggiordomo or Spanish mayordomo, from Medieval Latin major domus "chief of the household," also "mayor of the palace" under the Merovingians, from Latin maior "greater" (see major (adj.)) + genitive of domus "house" (from PIE root *dem- "house, household").