Longman Dictionary of Contemporary English homepage

scientific

 adjective
     
sci‧en‧tif‧ic S3 W2
1 [no comparative] about or related to science, or using its methods:
We believe in investing in scientific research.
the limits of scientific knowledge
decisions based on scientific evidence
the international scientific community (=scientists)
2 informal using an organized system:
I keep accounts for the business, but I'm not scientific about it.
3

the scientific method

the usual process of finding out information in science, which involves testing your ideas by performing experiments and making decisions based on the results
—scientifically adverb:
It hasn't been scientifically proven though.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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