B1
a test, especially a scientific one, that you do in order to learn something or to discover whether something is true
Dictionary examples:
The teacher's experiment to make math fun involved lots of ice cream. (0.0)
My brother's experiment to grow taller: hanging upside down for an hour daily. (0.0)
Our experiment to stay awake for a week ended after just one day. (0.0)
Some people believe that experiments on animals should be banned. (39.8)
Scientists are carrying out/doing experiments to test the effectiveness of the new drug. (48.8)