Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: Latin scientia 'knowledge', from scire 'to know'

science

 noun
     
NEW! See related topics: HARD SCIENCEEDUCATION
sci‧ence S1 W1
1 [uncountable]H knowledge about the world, especially based on examining, testing, and proving facts:
Many leading scientists do not consider that science can give absolutely reliable knowledge.
the founder of modern science, Isaac Newton
2 [uncountable]HSE the study of science:
What did you do in science class today?
3 [countable]HS a particular part of science, for example biology, chemistry, or physics:
the physical sciences
4

something is not an exact science

used to say that something involves a lot of guessing and there is not just one right way to do it:
Advertising is not an exact science - you're always taking a risk.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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