退院 (taiin) means 'leaving the hospital' or 'being discharged.' It is the opposite of 入院 and refers to when a patient is well enough to leave the hospital. For example, '来週退院できるそうです' (I heard you can be discharged next week).
治療が終わって病院から出ることです。入院の反対です。例:「退院する」
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