What does actuary mean?
The definition of actuary
Ac”tu*a*ry, n.; pl. Actuaries.
Etym: [L. actuarius copyist, clerk, fr. actus, p. p. of agere to do, act.]

1 (Law)
A registar or clerk; — used originally in courts of civil law jurisdiction, but in Europe used for a clerk or registar generally.
2 The computing official of an insurance company; one whose profession it is to calculate for insurance companies the risks and premiums for life, fire, and other insurances.