One who or that which secures.

(transitive) To make manifold; multiply. / (transitive, printing) To multiply or reproduce impressions of by a single operation.

(mathematics) One of the earlier theorems leading to Roth's theorem (a Diophantine approximation to algebraic numbers), establishing an exponent d/2+1+ε.

(automotive) An engine with two horizontally opposed cylinder banks, commonly used in Porsche and Subaru automobiles.