Meaning of ENTROPY in English

en ‧ tro ‧ py /ˈentrəpi/ BrE AmE noun [uncountable] technical

[ Date: 1800-1900 ; Language: German ; Origin: entropie , from Greek trepein 'to turn, change' ]

a lack of order in a system, including the idea that the lack of order increases over a period of time

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.