Origin: 1545–55; < Latin āctuārius shorthand writer, clerk, variant (with u of the action noun āctusact) of āctārius (āct(a) deeds, documents + -ārius-ary)
1550s, "registrar, clerk," from L. actuarius "copyist, account-keeper," from actus "public business" (see act). Modern insurance office meaning first recorded 1849. Related: Actuarial (1869).