The Collaborative International Dictionary of English v.0.48:

Suffice \Suf*fice"\, v. i. [imp. & p. p. Sufficed; p. pr. &
   vb. n. Sufficing.] [OE. suffisen, OF. soufire, F. suffire
   (cf. suffisant, p. pr.), L. sufficere to put under, to
   substitute, to avail for, to suffice; sub under + facere to
   make. See Fact.]
   To be enough, or sufficient; to meet the need (of anything);
   to be equal to the end proposed; to be adequate. --Chaucer.
   [1913 Webster]

         To recount almighty works,
         What words or tongue of seraph can suffice? --Milton.
   [1913 Webster]