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hos·pi·tal·iza·tion or chiefly Brit hos·pi·tal·isa·tion .häs-(.)pit-əl-ə-'zā-shən n
1) the act or process of being hospitalized <pain persisted constantly through a two-day period, finally necessitating \hospitalization (Jour. Amer. Med. Assoc.)>
2) the period of stay in a hospital <drug treatment shortened the length of \hospitalization (Today's Health)>
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hos·pi·tal·iza·tion (hos″pĭ-təl-ĭ-zaґshən) the confinement of a patient in a hospital, or the period of such confinement.Medical dictionary. 2011.