Source : Webster's Revised Unabridged Dictionary (1913)

Agist \A*gist"\, v. t. [OF. agister; [`a] (L. ad) + gister to
   assign a lodging, fr. giste lodging, abode, F. g[^i]te, LL.
   gistum, gista, fr. L. jacitum, p. p. of jac?re to lie: cf.
   LL. agistare, adgistare. See {Gist}.] (Law)
   To take to graze or pasture, at a certain sum; -- used
   originally of the feeding of cattle in the king's forests,
   and collecting the money for the same. --Blackstone.