1. A set of beliefs concerning the cause, nature, and purpose of the universe, especially when considered as the creation of a superhuman agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs.

  2. A specific fundamental set of beliefs and practices generally agreed upon by a number of persons or sects: the Christian religion; the Buddhist religion; etc.

  3. The body of persons adhering to a particular set of beliefs and practices: a world council of religions.

  4. The life or state of a monk, nun, etc.: to enter religion.

  5. The practice of religious beliefs; ritual observance of faith.

  6. Something one believes in and follows devotedly; a point or matter of ethics or conscience; to make a religion of fighting prejudice.

  7. Belief in, worship of, or obedience to a supernatural power or powers considered to be divine or to have control of human destiny.

  8. Any formal or institutionalized expression of such belief.

  9. The attitude and feeling of one who believes in a transcendent controlling power or powers.

  10. The way of life determined by the vows of poverty, chastity, and obedience entered upon the monks, friars, and nuns; to enter religion.

  11. Something of overwhelming importance to a person: football is his religion.

  12. Archaic (Ancient) a. The practice of sacred ritual observances b. Sacred rites and ceremonies.