habituation
ha·bi·tua·tion
noun
1.
being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs)
2.
a general accommodation to unchanging environmental conditions
Origin
From Middle English habituacioun, from Medieval Latin habituātio.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.