Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One that has charge of something; a caretaker: the custodian of a minor child's estate; the custodian of an absentee landlord's property.
  • n. A janitor: worked nights as custodian of a high school.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A person entrusted with the custody or care of something or someone; a caretaker or keeper.
  • n. a janitor (US); a cleaner

from the GNU version of the Collaborative International Dictionary of English

  • n. One who has care or custody, as of some public building; a keeper or superintendent.

from The Century Dictionary and Cyclopedia

  • n. One who has the care or custody of anything, as of a library, a public building, a lunatic, etc.; a keeper or guardian.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. one having charge of buildings or grounds or animals

Etymologies

From Medieval Latin *custodianus, implied in custodianatus, from custodia ("a keeping, watch, guard, prison"), from custos ("a keeper, watchman, guard"). (Wiktionary)

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