Source : Webster's Revised Unabridged Dictionary (1913)

Cipher \Ci"pher\, v. i. [imp. & p. p. {Ciphered}; p. pr. & vb.
   n. {Ciphering}.]
   To use figures in a mathematical process; to do sums in
   arithmetic.

         ``T was certain he could write and cipher too.
                                                  --Goldsmith.