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principal root
(mathematics) A complex number which, when raised to the power of n, yields the radicand of its nth degree radical, and which has the greatest real part among all such numbers, and positive imaginary part in case of equality of the real parts.
Principality of Liechtenstein
principal ultrafilter
(mathematics) An ultrafilter such that every set belonging to it is the superset of some fixed singleton set.
principal boy
The young male protagonist of a pantomime, traditionally played by a female.
principal boys
plural of principal boy
principal city
Synonym of central city (“the main city of a metropolitan area; particularly one containing multiple cities”). / Used other than figuratively or idiomatically: see principal, city.
principal cities
plural of principal city
Principality of Andorra
principal photography
(cinematography) The phase of film production during which the film is actually shot, as distinct from pre-production and post-production.