actuarial /æk.tjuˈɛəɹ.i.əl/ adjective2 •Of or pertaining to actuaries.The SOA and CAS jointly sponsor a Web site for those interested in pursuing an actuarial career. — 2006 •Relating to statistical calculation, especially pertaining to insurance.But in dealing with the problem of old-age insurance, some understanding of the actuarial principles becomes imperative, because their neglect has led many useful and well-meant experiments to grief. — 1913