(telecommunications) The number of telephone lines per 100 people in a region.

(philosophy) The theory that the reason is a source of knowledge independent of and superior to sense perception.

A loop transfer function

(mathematics, complex analysis, algebraic geometry) Any function expressible as the quotient of two (coprime) polynomials (and which thus has poles at a finite, discrete set of points which are the roots of the denominator).

an advocate of rational egoism

(philosophy) The doctrine that it is rational to act in one's own self-interest. / (philosophy) A theory espoused by Ayn Rand, combining this doctrine with ethical egoism.

(automotive) The ratio of the volume between the cylinder head of an internal combustion engine and the piston before and after the compression stroke

One who ratifies. / One who is in favor of ratification.

(India, finance) The proportion of loan-assets created by banks from the deposits received.

(aviation) An instrument installed in an aircraft that indicates the rate at which the aircraft is gaining or losing altitude.