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essential definition

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  • Definition — Def i*ni tion, n. [L. definitio: cf. F. d[ e]finition.] 1. The act of defining; determination of the limits; as, a telescope accurate in definition. [1913 Webster] 2. Act of ascertaining and explaining the signification; a description of a thing… …   The Collaborative International Dictionary of English

  • Essential medicines — Essential medicines, as defined by the World Health Organization are those drugs that satisfy the health care needs of the majority of the population; they should therefore be available at all times in adequate amounts and in appropriate dosage… …   Wikipedia

  • definition — late 14c., decision, setting of boundaries, from O.Fr. definicion, from L. definitionem (nom. definitio), noun of action from pp. stem of definire (see DEFINE (Cf. define)). In logic, meaning act of stating what something means is from 1640s;… …   Etymology dictionary

  • Definition — For other uses, see Definition (disambiguation). A definition is a passage that explains the meaning of a term (a word, phrase or other set of symbols), or a type of thing. The term to be defined is the definiendum. A term may have many different …   Wikipedia

  • Essential spectrum — In mathematics, the essential spectrum of a bounded operator is a certain subset of its spectrum, defined by a condition of the type that says, roughly speaking, fails badly to be invertible .The essential spectrum of self adjoint operatorsIn… …   Wikipedia

  • Essential matrix — In computer vision, the essential matrix is a 3 imes 3 matrix mathbf{E} , with some additional properties, which relates corresponding points in stereo images assuming that the cameras satisfy the pinhole camera model.FunctionMore specifically,… …   Wikipedia

  • Essential range — In mathematics, particularly measure theory, the essential range of a function is intuitively the non negligible range of the function. One way of thinking of the essential range of a function is the set on which the range of the function is most …   Wikipedia

  • Essential manifold — In mathematics, in algebraic topology and differential geometry, the notion of an essential manifold seems to have been first introduced explicitly in Mikhail Gromov s classic text in 83 (see below). DefinitionA closed manifold M is called… …   Wikipedia

  • definition — noun Etymology: Middle English diffinicioun, from Anglo French, from Latin definition , definitio, from definire Date: 14th century 1. an act of determining; specifically the formal proclamation of a Roman Catholic dogma 2. a. a statement… …   New Collegiate Dictionary

  • Essential subgroup — In mathematics, especially in the area of algebra studying the theory of abelian groups, an essential subgroup is a subgroup that determines much of the structure of its containing group. The concept was generalized to essential… …   Wikipedia

  • definition —    , define, defining    Definition is the act of conveying fundamental character, while being very specific, clear, and concise. Although it may be a statement expressing the essential nature of something, as in a statement of the meaning of a… …   Glossary of Art Terms

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