Definition of stratify verb from the Oxford Advanced Learner's Dictionary

 

stratify

 verb
verb
BrE BrE//ˈstrætɪfaɪ//
 
; NAmE NAmE//ˈstrætɪfaɪ//
 
Verb Forms present simple I / you / we / they stratify
BrE BrE//ˈstrætɪfaɪ//
 
; NAmE NAmE//ˈstrætɪfaɪ//
 
he / she / it stratifies
BrE BrE//ˈstrætɪfaɪz//
 
; NAmE NAmE//ˈstrætɪfaɪz//
 
past simple stratified
BrE BrE//ˈstrætɪfaɪd//
 
; NAmE NAmE//ˈstrætɪfaɪd//
 
past participle stratified
BrE BrE//ˈstrætɪfaɪd//
 
; NAmE NAmE//ˈstrætɪfaɪd//
 
-ing form stratifying
BrE BrE//ˈstrætɪfaɪɪŋ//
 
; NAmE NAmE//ˈstrætɪfaɪɪŋ//
 
 
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[usually passive] stratify something (formal or specialist) to arrange something in layers or strata a highly stratified society stratified rock Word Origin mid 17th cent.: from French stratifier, based on Latin stratum, literally ‘something spread or laid down’, neuter past participle of sternere ‘strew’.
See the Oxford Advanced American Dictionary entry: stratify