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3 definitions found
 for Atomic theory
From The Collaborative International Dictionary of English v.0.48 :

  Theory \The"o*ry\, n.; pl. Theories. [F. th['e]orie, L.
     theoria, Gr. ? a beholding, spectacle, contemplation,
     speculation, fr. ? a spectator, ? to see, view. See
     Theater.]
     1. A doctrine, or scheme of things, which terminates in
        speculation or contemplation, without a view to practice;
        hypothesis; speculation.
        [1913 Webster]
  
     Note: "This word is employed by English writers in a very
           loose and improper sense. It is with them usually
           convertible into hypothesis, and hypothesis is commonly
           used as another term for conjecture. The terms theory
           and theoretical are properly used in opposition to the
           terms practice and practical. In this sense, they were
           exclusively employed by the ancients; and in this
           sense, they are almost exclusively employed by the
           Continental philosophers." --Sir W. Hamilton.
           [1913 Webster]
  
     2. An exposition of the general or abstract principles of any
        science; as, the theory of music.
        [1913 Webster]
  
     3. The science, as distinguished from the art; as, the theory
        and practice of medicine.
        [1913 Webster]
  
     4. The philosophical explanation of phenomena, either
        physical or moral; as, Lavoisier's theory of combustion;
        Adam Smith's theory of moral sentiments.
        [1913 Webster]
  
     Atomic theory, Binary theory, etc. See under Atomic,
        Binary, etc.
        [1913 Webster]
  
     Syn: Hypothesis, speculation.
  
     Usage: Theory, Hypothesis. A theory is a scheme of the
            relations subsisting between the parts of a systematic
            whole; an hypothesis is a tentative conjecture
            respecting a cause of phenomena.
            [1913 Webster] Theosoph

From The Collaborative International Dictionary of English v.0.48 :

  Atomic \A*tom"ic\, Atomical \A*tom"ic*al\, a. [Cf. F. atomique.]
     1. Of or pertaining to atoms.
        [1913 Webster]
  
     2. Extremely minute; tiny.
        [1913 Webster]
  
     Atomic bomb, see atom bomb in the vocabulary.
  
     Atomic philosophy, or Doctrine of atoms, a system which,
        assuming that atoms are endued with gravity and motion,
        accounted thus for the origin and formation of all things.
        This philosophy was first broached by Leucippus, was
        developed by Democritus, and afterward improved by
        Epicurus, and hence is sometimes denominated the Epicurean
        philosophy.
  
     Atomic theory, or the Doctrine of definite proportions
        (Chem.), teaches that chemical combinations take place
        between the supposed ultimate particles or atoms of
        bodies, in some simple ratio, as of one to one, two to
        three, or some other, always expressible in whole numbers.
        
  
     Atomic weight (Chem.), the weight of the atom of an element
        as compared with the weight of the atom of hydrogen, taken
        as a standard.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  atomic theory
      n 1: a theory of the structure of the atom
      2: (chemistry) any theory in which all matter is composed of
         tiny discrete finite indivisible indestructible particles;
         "the ancient Greek philosophers Democritus and Epicurus held
         atomic theories of the universe" [syn: atomism, atomic
         theory, atomist theory, atomistic theory] [ant:
         holism, holistic theory]

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