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Webster 1913 Edition

Noun.

[L.

spectatio

Regard; aspect; appearance.

Harvey.

Noun.

[L. spectatio.] Regard; respect. [Little used.]

spectation ‎(uncountable)

(archaic, rare) Regard; aspect; appearance.
This simple spectation of the lungs is differenced from that which concomitates a pleurisy. — Harvey.
(rare) The act of watching something; observation.
- 1996, David Foster Wallace, Infinite Jest, Abacus 2013, p. 34:
  the medical attaché is permitted to ease effortlessly from unwound spectation into a fully relaxed night's sleep, still right there in the recumbent recliner [...].