unilineal evolution
Motion of an object toward or away from an observer. / (astronomy) Motion of a star toward or away from the earth.
(social sciences, anthropology) The theory, now considered obsolete, that societies evolve in a single direction toward complexity, progress, and civilization.
(telecommunications) Of, pertaining to, or carrying a wide band of electromagnetic frequencies
(pathology) A narrowing of the pylorus which prevents the normal passage of food from the stomach to the small intestine.
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