complexity theory
n 1. (Mathematics) maths the study of complex systems, including subjects such as chaos theory and genetic algorithms
2. (Computer Science) computing a field in theoretical computer science dealing with the resources required during computation to solve a given problem
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014