The collective feeling of well-being (or otherwise) of an electorate, a high one supposedly favouring the incumbent party in an election.

An indication of how long a sunscreen remains effective when applied to the skin.

(aviation) The load factor necessary for an airline to break even. It is a function of the percent of seats filled at a particular yield versus the airlines operating costs.

plural of breakeven load factor

(medicine, biochemistry) Any of several polypeptide hormones, produced by macrophages, that can destroy some cancer cells.

(biochemistry) a functional protein complex required for the survival, growth and specialization of certain types of neurons in vertebrates.

(travel industry, aviation) (Formerly, no longer in use) An IATA defined amount used to adjust Fare Construction Units in international airfare calculations.

(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.

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