or•dainɔrˈdeɪn(v.t.)

1. to invest with ministerial or sacerdotal functions; confer holy orders upon.

   Category: Religion

2. to enact or establish by law, edict, etc.

3. to decree; give orders for.

4. (of God, fate, etc.) to destine or predestine.

5. Archaic.to select for or appoint to an office.

6. (v.i.)to order or command.

Origin of ordain:

1250–1300; ME < OF ordener < L ordināre to order, arrange, appoint. See ordination

or•dain′er(n.)