natural science

noun
a science or knowledge of objects or processes observable in nature, as biology or physics, as distinguished from the abstract or theoretical sciences, as mathematics or philosophy.

Origin:
1350–1400; Middle English

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
natural science
 
n
1.  the sciences collectively that are involved in the study of the physical world and its phenomena, including biology, physics, chemistry, and geology, but excluding social sciences, abstract or theoretical sciences, such as mathematics, and applied sciences
2.  any one of these sciences
 
natural scientist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
natural science  
A science, such as biology, chemistry, or physics, that deals with the objects, phenomena, or laws of nature and the physical world.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Intelligence is not a science, certainly not a natural science.
What you mean is economics is not a natural science.
While it's true that economics is not a natural science, that is trivial and
  not what they mean.
Every known fact in natural science was divined by the presentiment of
  somebody, before it was actually verified.
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