Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A kind of viceregal locum tenens appointed, either alone or jointly, to execute the political duties of a monarch during his or her absence from the seat of government.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

First attested in the plural in October 1644 and in the singular in 1683; Latin: cūstōs ("guard”, “protector”; “guardian”; “keeper”, “custodian") + rēgnī (“of royal power”; genitive singular of rēgnum, “royal power”, “kingdom”) = “custodian of royal power” ≈ “guardian of the realm”.

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