scientific

adj. of or pertaining to science; systematic, methodical; adhering to the principles of an exact science

Science (from the Latin scientia, 'knowledge'), in the broadest sense, refers to any systematic knowledge or practice. Examples of the broader use included political science and computer science, which are not incorrectly named, but rather named according to the older and more general use of the word. In a more restricted sense, science refers to a system of acquiring knowledge based on the scientific method, as well as to the organized body of knowledge gained through such research. This article focuses on the more restricted use of the word.
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Science /sci·ence/ 1. the systematic observation of natural phenomena for the purpose of discovering laws governing those phenomena. 2. [more]Scientific - Community and Resources

Adjective
1. of or relating to the practice of science; "scientific journals"
(pertainym) scientific knowledge
2. conforming with the principles or methods used in science; "a scientific approach"
(antonym) unscientific
(similar) technological
(attribute) scientific knowledge

(a.)
Of or pertaining to science; used in science; as, scientific principles; scientific apparatus; scientific observations.
  

(a.)
Having a knowledge of science, or of a science; evincing science or systematic knowledge; as, a scientific chemist; a scientific reasoner; a scientific argument.
  

(a.)
Agreeing with, or depending on, the rules or principles of science; as, a scientific classification; a scientific arrangement of fossils.