Abstract: A formal theory of meaning (the process of knowledge accumulation) as multiplicative chaos is proposed. The epistemological process is understood as the process of subjective extraction of some knowledge from the incoming information. The concepts of nonsense are introduced as a meaning that has a minimum value equal to one and the level of intelligence as a geometric mean of the cumulative meaning. The thesis of the multiplicativity of meaning, its polymorphism is substantiated, and numerous examples from world history are provided. By analogy with classical thermodynamics, three laws of thermodynamics of meaning are postulated. Estimates of the cumulative meaning when the comprehension of information (multiplicative cascade) is a random process with given statistical characteristics are carried out.