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Latin word sanctus comes from Proto-Indo-European *sān-
*sān- (Proto-Indo-European)
sancio (Latin)
(legal) I fix (unalterably); establish, decree, ordain; enact, confirm, ratify, sanction.. I devote, consecrate, dedicate.. I forbid under the pain of punishment, enact a penalty against.. I render, make or appoint as sacred or inviolable by a religious act.
sanctus (Latin)
(Late Latin) A person who is officially proclaimed as having lived a life of heroic virtue.. (Late Latin) A saint; person who lives a holy and virtuous life.. (Late Latin) A title given to (2), usually capitalized, prefixed to the person's name.