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

1545–55; < Latin āctuārius shorthand writer, clerk, variant (with u of the action noun āctus act) of āctārius (āct(a) deeds, documents + -ārius -ary)

actuarial [ak-choo-air-ee-uhl] , actuarian, adjective
actuarially, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actuary (ˈæktʃʊərɪ)
n , pl -aries
a person qualified to calculate commercial risks and probabilities involving uncertain future events, esp in such contexts as life assurance
[C16: (meaning: registrar): from Latin āctuārius one who keeps accounts, from actum public business, and acta documents, deeds. See act, -ary]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
actuary [(ak-chooh-er-ee)]

A mathematician who uses statistics to calculate insurance premiums.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Price is celebrated for creating the first actuarial model for life insurance.
At best, it is a macabre bet against the lives of the donors, without enough
  people in the pot to get to actuarial averages.
Insurance profits and losses on the business of insurance are based on
  actuarial science.
If the actuarial tables hold true, it will be his lot to see his legacy
  bitterly debated for many years.
Related Words
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