The word "ectropy" means a general increase in organization. It appears to have been developed by Willard V. Quine in response to the Twenty-first Anniversary Symposium of the Council for Unified Research and Education in 1969. Specifically, the term is described:
The above quotation appears on page 83 of the following source:
That book is an expansion of the aforementioned 1969 symposium. The term "ectropy" is used in several places in the book and is contrasted not only with "entropy" but also with the coined term, "atropy," which is used to describe circumstances in which the degree of organization remains constant.