noun, plural ac·tu·ar·ies.

  1. Insurance. a person who computes premium rates, dividends, risks, etc., according to probabilities based on statistical records.
  2. (formerly) a registrar or clerk.

noun plural -aries

  1. a person qualified to calculate commercial risks and probabilities involving uncertain future events, esp in such contexts as life assurance

1550s, “registrar, clerk,” from Latin actuarius “copyist, account-keeper,” from actus “public business” (see act (n.)). Modern insurance office meaning first recorded 1849.

A mathematician who uses statistics to calculate insurance premiums.

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