Of, or having to do with science.
"The scientific method helped us determine the cause of the strange noise in the lab."
In plain English: Scientific means based on facts and careful study rather than just guesses or opinions.
"The scientific team studied how climate change affects local weather patterns."
Usage: Use scientific when describing methods that follow established principles of inquiry rather than casual observation. This adjective is often confused with the noun form in phrases like "a scientific approach," but it functions strictly as a modifier here.
The word entered English from Middle French and originally meant pertaining to science. Its meaning has remained consistent since it was adopted into the language.