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Webster 1913 Edition

Noun.

[L.

excusatio

: cf. F.

excusation

Excuse; apology.

[Obs.]

Bacon.

Noun.

s as z. Excuse; apology. [Little used.]

excusation ‎(plural excusations)

(obsolete) The act of offering an excuse or apology, or the fact of being excused; an excuse, a defence.
- 1646, Thomas Browne, Pseudodoxia Epidemica, I.2:
  And his goodness is to be admired, that it refuted not his argument in the punishment of his excusation, and only pursued the first transgression without a penalty of this the second.