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.
I wish to establish some sort of system not guided by chance but by some sort of definite and exact principle.
Dmitri Mendeleev, Lecture to the Russian Chemical Society as quoted in "Peering Into the Unseen—What Is Revealed?" in Awake! magazine (22 August 2000).