Definitions of hospitalization:

• noun:   placing in medical care in a hospital
• noun:   the condition of being treated as a patient in a hospital

  Example: "He hoped to avoid the expense of hospitalization"

• noun:   a period of time when you are confined to a hospital

  Example: "Now they try to shorten the patient's hospitalization"

• noun:   insurance that pays all or part of a patient's hospital expense