actuary (n.)

1550s, "registrar, clerk," from Medieval Latin actuarius "copyist, account-keeper, short-hand writer," from Latin actus in the specialized sense "public business" (literally "a doing;" from PIE root *ag- "to drive, draw out or forth, move"). Meaning "person skilled in the calculation of chances and costs," especially as employed by an insurer, is from 1849.

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