habituation (n.)youdaoicibaDictYouDict[habituation 词源字典]
mid-15c., "action of forming a habit; customary practice," from Medieval Latin habituationem (nominative habituatio), noun of action from past participle stem of habituare "bring into a condition or habit of the body" (see habituate (v.)). Meaning "condition of being habituated" is from 1816.[habituation etymology, habituation origin, 英语词源]