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Webster 1913 Edition

Noun.

[L.

opinatio

. See

The act of thinking; a supposition.

[Obs.]

Noun.

Act of thinking; opinion. [Not used.]

opination ‎(plural opinations)

the state or process of opining.
Because of this lack of detail in the Constitution, the role of the Supreme Court had been open to opination.

the state or process of opining