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ordain
2a: to establish or order by appointment, decree, or law : enact <we the people…do ordain and establish this Constitution — United States Constitution>
[M-W's Col. Dic.]

Please explain to me the following definition:
1: to establish by appointment, decree, or law
2: to order by appointment, decree, or law
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Here's my take. The two words mean essentially the same thing, but 'ordain' seems to carry a religious connotation, as priest and ministers in Christian churches are ordained.
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#1: to establish or order by appointment, decree, or law =enact
The Constitution is enacted >> The Constitution is established by decree >> The Constitution is ordained (by the people)

#2 A decree is used to ordain something. It is the noun, not the verb, in this context.
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Comments  
Jackson6612ordain
2a: to establish or order by appointment, decree, or law : enact <we the people…do ordain and establish this Constitution — United States Constitution>
[M-W's Col. Dic.]

Please explain to me the following definition:
1: to establish by appointment, decree, or law
2: to order by appointment, decree, or law
1: You can establish something by decree; likewise you can also establish by law. How can you establish something by appointment?
2: I don't understand how you can order by appointment. Saying to order by decree is meaningless because both mean the same. Saying ''to order by the power of law vested in you does make sense.
 Feebs11's reply was promoted to an answer.
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