The measurement of a specific substance's ability to absorb radiant energy; absorptivity.

One of the serine proteases of the coagulation system, whose absence leads to hemophilia.

(algebra, ring theory) A ring in which every non-zero, non-unit (i.e., proper) element can be factored into a product of prime elements (not necessarily distinct), such that such factorization is unique up to permutation of the factors and the replacing of primes by their associate primes.

(algebra, ring theory) A unique factorization ring which is also an integral domain.

A measure reflecting the average number of citations to recent articles published in an academic journal, used as an approximation of the relative importance of a journal within its field.

(idiomatic, transitive) To consider as a factor.

(quantum mechanics) A normalized complex number, considered as, say, the scalar coefficient of a ket.

(economics) The system or infrastructure for economic exchange within which factors of production (such as labor, materials, or capital) are purchased or sold.

(marine chemistry) A measure of how readily ocean waters will uptake atmospheric carbon dioxide.

(fluid mechanics) A dimensionless friction factor relating the head loss over a pipe to the lengthscale of the pipe and the fluid velocity.