Surplusage, n.
Etymology: [See Surplus, and cf. Superplusage.]
1. Surplus; excess; overplus; as, surplusage of grain or goods beyond what is wanted. Take what thou please of all this surplusage. Spenser. A surplusage given to one part is paid out of a reduction from another part of the same creature. Emerson.
2. (Law)
Matter in pleading which is not necessary or relevant to the case, and which may be rejected.
3. (Accounts)
1 more senses
A greater disbursement than the charge of the accountant amounts to. [Obs.] Rees.
Shades of meaning
Fernald has no entry of its own for surplusage; he lists it under circumlocution.
He lists it without comment; the entries above explain its neighbors.