1. an official connection or association with an organization, group, or institution
2. the act of joining or connecting with a group or organization

Examples

• The professor’s affiliation with the university spans over twenty years.
• She listed her political affiliation on the voter registration form.
• The research was conducted without any corporate affiliation.
• His affiliation with the medical association helped advance his career.
• The newspaper disclosed its affiliation with the parent company.
• Students can join clubs regardless of their religious affiliation.
• The merger created a new affiliation between the two hospitals.