- noun a measure of the energy in a system or process that is unavailable to do work
- noun a measure of the degree of disorder in a closed system
- A measure of the disorder of a system, such as the universe. The more order a system has, the less its entropy. The greater the entropy in a system, the lesser its energy available to do work.
- In communications, a measure of the information contained in a signal, or of transmission efficiency.
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