In the Roman Catholic Church, a secular institute is an organization of individuals who are consecrated persons – professing the Evangelical counsels of chastity, poverty and obedience – while living in the world, unlike members of a religious order who live in community. It is one of the forms of consecrated life recognized in Church law (cf. the Code of Canon Law, can. 710-730).
Canon 710
A secular institute is an institute of consecrated life in which the Christian faithful living in the world strive for the perfection of charity and work for the sanctification of the world especially from within.