Source : Webster's Revised Unabridged Dictionary (1913)

Stratify \Strat"i*fy\, v. t. [imp. & p. p. {Stratified}; p. pr.
   & vb. n. {Stratifying}.] [Stratum + -fy: cf. F. stratifier.]
   To form or deposit in strata, or layers, as substances in the
   earth; to arrange in strata.