Meaning

noun a person who is head of an administrative department of government

noun an assistant who handles correspondence and clerical work for a boss or an organization

noun a person to whom a secret is entrusted

originFrom Medieval Latin secrētārius (“one entrusted with secrets”), from Latin secrētus (“private, secret”), past participle of secernere (“to separate, set apart”), from se- (“apart”) + cernere (“to separate”).

Etymology from Wiktionary, CC BY-SA 3.0