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Webster's Dictionary (1865)

Sûr'plus-age, n.

noun

n. [See supra, and cf. SUPERPLUS-AGE.]

  1. Surplus; excess; as, surplusage of grain or goods beyond what is wanted.
  2. (Law.) Matter in pleading not necessary or relevant to the case, and which may be rejected.
  3. (Accounts.) A greater disbursement than the charge of the accountant amounts to.