Accustom (verb)

1. To make (someone) familiar with something through regular exposure.
2. To habituate someone to something.

Origin:

Middle english: from old french accoustumer, from a- (from latin ad "to") + costume "custom".

Examples:

1. She had to accustom herself to the new environment.
2. He had to accustom himself to the new diet.
3. The company had to accustom its employees to the new software.
4. The dog had to accustom itself to the new owner.
5. The baby had to accustom itself to the new schedule.