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A "third order" refers to an organization of lay people who live in secular society but follow a religious rule and are directed by a religious order. These groups are often affiliated with a larger religious order, such as the Franciscans or Dominicans.12

In the Roman Catholic tradition, the first order typically includes ordained priests and brothers, the second order consists of contemplative nuns, and the third order comprises laymen and laywomen who adhere to modified vows. These lay members, known as "tertiaries," may take vows that include celibacy. This structure allows individuals to live a religious life while remaining integrated into society, often engaging in humanitarian work like nursing.2

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