From The Collaborative International Dictionary of English v.0.48:
Net \Net\, a. [F. See Neat clean.]
1. Without spot; pure; shining. [Obs.]
[1913 Webster]
Her breast all naked as net ivory. --Spenser.
[1913 Webster]
2. Free from extraneous substances; pure; unadulterated;
neat; as, net wine, etc. [R.]
[1913 Webster]
3. Not including superfluous, incidental, or foreign matter,
as boxes, coverings, wraps, etc.; free from charges,
deductions, etc; as, net profit; net income; net weight,
etc. [Less properly written nett.]
[1913 Webster]
Net tonnage (Naut.), the tonnage of a vessel after a
deduction from the gross tonnage has been made, to allow
space for crew, machinery, etc.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
nett \nett\ adj.
remaining after all deductions; same as net a., 3.
Contrasted to gross. [Brit.] [Narrower terms: take-home]
Syn: net, clear.
[WordNet 1.5]