science

Science is observing, studying and experimenting to learn how the world works. (noun)

An example of science is biology.

See science in Webster's New World College Dictionary

noun

Archaic the state or fact of knowledge; knowledge
systematized knowledge derived from observation, study, and experimentation carried on in order to determine the nature or principles of what is being studied
any specific branch of scientific knowledge, esp. one concerned with establishing and systematizing facts, principles, and methods, as by experiments and hypotheses: the science of mathematics
1. the systematized knowledge of nature and the physical world
2. any branch of this
skill based upon systematized training: the science of cooking
☆ Christian Science

See science in American Heritage Dictionary 4

(sīˈəns)

noun

a. The observation, identification, description, experimental investigation, and theoretical explanation of phenomena.
b. Such activities restricted to a class of natural phenomena.
c. Such activities applied to an object of inquiry or study.
Methodological activity, discipline, or study: I've got packing a suitcase down to a science.
An activity that appears to require study and method: the science of purchasing.
Knowledge, especially that gained through experience.
Science Christian Science.