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