from
The Collaborative International Dictionary of English v.0.48
Actuary \Ac"tu*a*ry\, n.; pl. {Actuaries}. [L. actuarius
copyist, clerk, fr. actus, p. p. of agere to do, act.]
1. (Law) A registrar or clerk; -- used originally in courts
of civil law jurisdiction, but in Europe used for a clerk
or registrar generally.
[1913 Webster]
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.
[1913 Webster]