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Webster 1913 Edition

Noun.

The act of disconcerting, or state of being disconcerted; discomposure; perturbation.

[R.]

State Trials (1794).

Noun.

The act of disconcerting.

disconcertion ‎(uncountable)

Anxious embarrassment
- Stephen R. Donaldson, The One Tree
  Shadows flickered like disconcertion across their bestial faces as they saw the three men rising to meet them instead of fleeing.