rationalist
ra·tio·na·list
adjective
1.
noun
1.
someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes
Origin
From Middle French rationaliste; rational + -ist.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.