Science/ˈsaɪəns/ Definition 1 of 4Pro Tip 1/3Academic Subjects Refers to subjects you study in school, like physics and biology. She excels in science, especially in biology. Pro Tip 2/3Not Always Physical Science also covers things you can't touch, like psychology. Psychology is a fascinating science focusing on the mind. Pro Tip 3/3Broad Knowledge Science is about understanding a wide range of natural phenomena. Her knowledge of science includes everything from atoms to galaxies.