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Webster 1913 Edition

Noun.

The act of putting to sleep, or the state of being put to sleep; sleep.

[Obs.]

Dementation and

sopition

of reason.

Sir T. Browne.

Noun.

[L. sopio, to lay asleep.] Sleep. [Not in use.]

sopition ‎(uncountable)

(obsolete, nonce word) The act of putting to sleep.
Dementation and sopition of reason. — Sir Thomas Browne.