The Collaborative International Dictionary of English v.0.48:

Stater \Stat"er\ (st[=a]t"[~e]r), n.
   One who states.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Stater \Sta"ter\ (st[=a]"t[~e]r), n. [L. stater, Gr. stath`r.]
   (Gr. Antiq.)
   The principal gold coin of ancient Greece. It varied much in
   value, the stater best known at Athens being worth about
   [pounds]1 2s., or about $5.35 (in 1890 value). The Attic
   silver tetradrachm was in later times called stater.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

stater
    n 1: any of the various silver or gold coins of ancient Greece
    2: a resident of a particular state or group of states;
       "Keystone stater"; "farm staters"

Easton's 1897 Bible Dictionary:

Stater
   Greek word rendered "piece of money" (Matt. 17:27, A.V.; and
   "shekel" in R.V.). It was equal to two didrachmas ("tribute
   money," 17:24), or four drachmas, and to about 2s. 6d. of our
   money. (See SHEKEL.)