the process of someone becoming institutionalized (= unable to live independently because they are used to living in an institution):
The pathology of institutionalization has been acknowledged for decades.
More examples
Prompt clinical intervention can delay the need for institutionalization.
He had an altercation with the police that led to institutionalization in the Nevada Mental Health Institute.
These patients may require high-level care or institutionalization through their adult years.
What I see happening to him is institutionalization, as opposed to giving him the support he needs for the real world.

"The state of being placed or kept in a residential institution

Example: People with a history of long-term institutionalization"
harmful effects such as apathy and loss of independence arising from spending a long time in an institution."
(Oxford languages dictionary)