One more from Ammon Shea:
I’m constantly finding that the former meaning of a word differs significantly from how I know it today. When I learned that secretary meant “one privy to a secret” during the fourteenth century I was utterly delighted. And then almost immediately I began scolding myself for not having realized such an obvious precedent, and thought that I should feel no excitement at discovering something that in hindsight seems so obvious. But it is exciting to make these little discoveries about the language, and it shouldn’t matter at all if they are obvious to someone else.The earliest Oxford English Dictionary definition of secretary: “one who is entrusted with private or secret matters; a confidant; one privy to a secret.” Secretary comes into English from medieval Latin: “sēcrētārius a secretary, notary, scribe, etc., a title applied to various confidential officers (properly an adj.).”
Reading the OED: One Man, One Year, 21,730 Pages (New York: Penguin, 2008).
Is the secret of secretary already obvious to you? It wasn’t to me. I told my mom, who worked as an executive secretary in the 1950s, about it: she didn’t know either.
[Peanuts, October 29, 1971. Peanuts past is Peanuts present.]
Related reading
All OCA dictionary posts (Pinboard)
Words of the day: apricity, apricot
A home entertainment system
[“One privy to a secret”: why the OED italicizes to must remain a secret.]