Free Carrier. In international commerce, an agreement between a seller and a buyer indicating that the seller has fulfilled his/her obligation to deliver a good when he/she has transferred it to the port, airport, or other place from which it will be transported.
Definition of UNIT FRACTION. : a fraction whose numerator is unity and whose denominator is an integer.
Definition 1. A unitary operator is a bounded linear operator U : H â H on a Hilbert space H that satisfies U*U = UU* = I, where U* is the adjoint of U, and I : H â H is the identity operator. The weaker condition U*U = I defines an isometry. The other condition, UU* = I, defines a coisometry.