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The adjustment in natural or human systems in response to actual or expected climatic stimuli or their effects, which moderates harm or exploits beneficial opportunities. Various types of adaptation can be distinguished, including anticipatory, autonomous and planned adaptation.
Appendix 1 Glossary. In Climate Change 2007 Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Parry, M.L., Canziani, O.F., Palutikof,J.P., van der Linden, P.J. & Hanson, C.E. (eds.). Cambridge University Press, Cambridge, UK. p. 976
Alternative definition

Evolution occurs as a result of adaptation to new environment (i.e. modification of an organism as its parts that makes it more fit for existence under the conditions of its environment.

Alternative source

Commission for Controlling the Desert Locust in the Central Region (CRC), FAO, 2009; TRG(A16.22)/KCCM, FAO, 2009.