Frequency: The word is one of the 3000 most common words in English.
1.
Scientific is used to describe things that relate to science or to a particular science.
Scientific research is widely claimed to be the source of the high standard of living in the US.
...the use of animals in ~ experiments.
ADJ: usu ADJ n
~ally
...~ally advanced countries.
ADV
2.
If you do something in a ~ way, you do it carefully and thoroughly, using experiments or tests.
It’s not a ~ way to test their opinions.
= systematic
ADJ: usu ADJ n
~ally
Efforts are being made to research it ~ally.
ADV