|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|—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 |
A mathematician who uses statistics to calculate insurance premiums.