What does "secular" mean?

Additional senses

1. 2.Of or pertaining to this present world, or to things not spiritual or holy; relating to temporal as distinguished from eternal interests; not immediately or primarily respecting the soul, but the body; worldly. New foes arise, Threatening to bind our souls with secular chains. Milton.
2. 3.(Eccl.) Not regular; not bound by monastic vows or rules; not confined to a monastery, or subject to the rules of a religious community; as, a secular priest. He tried to enforce a stricter discipline and greater regard for morals, both in the religious orders and the secular clergy. Prescett.
3. 4.Belonging to the laity; lay; not clerical. I speak of folk in secular estate. Chaucer. Secular equation (Astron.), the algebraic or numerical expression of the magnitude of the inequalities in a planet's motion that remain after the inequalities of a short period have been allowed for. -- Secular games (Rom. Antiq.), games celebrated, at long but irregular intervals, for three days and nights, with sacrifices, theatrical shows, combats, sports, and the like. -- Secular music, any music or songs not adapted to sacred uses. -- Secular hymn or poem, a hymn or poem composed for the secular games, or sung or rehearsed at those games.
4. 5.(Eccl.) A secular ecclesiastic, or one not bound by monastic rules. Burke.
5. 6.(Eccl.) A church official whose functions are confined to the vocal department of the choir. Busby.
6. 7.A layman, as distinguished from a clergyman.