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Definition of hard science noun from the Oxford Advanced Learner's Dictionary

hard science

noun
 
/ˌhɑːd ˈsaɪəns/
 
/ˌhɑːrd ˈsaɪəns/
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  1. [uncountable] science that is based on measuring and observing physical facts or events and is not influenced by personal feelings or opinions
  2. [countable] a science that involves measuring and observing physical facts or events, such as physics and chemistry, and is not influenced by personal feelings or opinions
See hard science in the Oxford Advanced American Dictionary
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