Communication (from Latin commūnicāre, meaning "to share") is the act of conveying intended meanings from one entity or group to another through the use of mutually understood signs and semiotic rules.
Precedents are not mere dusty phrases, which do not substantially affect the question before us. A precedent embalms a principle. The principle may be right or may be wrong—that is a question for discussion; but at the first glance it is right to conclude that it is a principle that has been acted upon and recognised by those who preceded us.
Benjamin Disraeli, Speech in the House of Commons (22 February 1848)