Definition of science:
1. the state of knowing :knowledge as distinguished from ignorance or misunderstanding
2a :a department of systematized knowledge as an object of study
the science of theology
b :something (such as a sport or technique) that may be studied or learned like systematized knowledge
3a :knowledge or a system of knowledge covering general truths or the operation of general laws especially as obtained and tested through scientific method
b :such knowledge or such a system of knowledge concerned with the physical world and its phenomena :natural science
4:a system or method reconciling practical ends with scientific laws
5capitalized :christian science