Longman Dictionary of Contemporary English homepage

thinker

 noun
     
Related topics: Philosophy
think‧er [countable]
1RP someone who thinks carefully about important subjects such as science or philosophy, especially someone who is famous for thinking of new ideas:
great thinkers such as Kant and Schopenhauer
2

an independent/a positive/a free etc thinker

a person who thinks in a particular way
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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