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Webster 1913 Edition

Noun.

[L.

sedatio

The act of calming, or the state of being calm.

[R.]

Coles.

Noun.

The act of calming. [Not in use.]

See also: sédation

sedation ‎(countable and uncountable, plural sedations)

The act of sedating, especially by use of sedatives.
The patient was so agitated that the doctor resorted to sedation.

act