knowledge; knowledge of principles and causes; ascertained truth of facts.-accumulated and established knowledge, which has been systematized and formulated with reference to the discovery of general truths or the operation of general laws; knowledge classified and made available in work, life, or the search for truth; comprehensive, profound, or philosophical knowledge.-especially, such knowledge when it relates to the physical world and its phenomena, the nature, constitution, and forces of matter, the qualities and functions of living tissues, etc.; -- called also natural science, and physical science.-any branch or department of systematized knowledge considered as a distinct field of investigation or object of study; as, the science of astronomy, of chemistry, or of mind.-art, skill, or expertness, regarded as the result of knowledge of laws and principles.-to cause to become versed in science; to make skilled; to instruct.