1676, "secret or private stories," from Gk.
anekdota "things unpublished," neut. pl. of
anekdotos, from
an- "not" +
ekdotos "published," from
ek- "out" +
didonai "to give" (see
date (1)). Procopius' 6c.
Anecdota, unpublished memoirs of Emperor Justinian full of court gossip, gave the word a sense of "revelation of secrets," which decayed in Eng. to "brief, amusing stories" (1761).
Anecdotage "garrulous old age" is a jocular formation of De Quincey's from 1823.