In education thermodynamics, megaentropy is a hypothetical type of entropy, conceived by American economist Jeremy Rifkin, that supposedly defies the second law of thermodynamics, and is associated with the collection of information and the buildup of intellect in the learning process. [1] The term seems to be some type of backwards spin-off of the material entropy hypothesis.

References
1. Rifkin, Jeremy. (1989). Entropy: Into the Greenhouse World (revised edition), (pg. 182). New York: Bantam.