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in the PONS Dictionary

strati·fy <-ie-> [ˈstrætɪfaɪ, Am -t̬ə-] VB trans

1. stratify (arrange in layers):

to stratify sth
etw schichten

2. stratify usu passive GEOL:

to be stratified
geschichtet [o. spec stratifiziert] sein

3. stratify (place in groups):

to stratify sb/sth [by sth]
jdn/etw [nach etw dat] klassifizieren
stratified society
mehrschichtige Gesellschaft
Present
Istratify
youstratify
he/she/itstratifies
westratify
youstratify
theystratify
Past
Istratified
youstratified
he/she/itstratified
westratified
youstratified
theystratified
Present Perfect
Ihavestratified
youhavestratified
he/she/ithasstratified
wehavestratified
youhavestratified
theyhavestratified
Past Perfect
Ihadstratified
youhadstratified
he/she/ithadstratified
wehadstratified
youhadstratified
theyhadstratified
See further verb tables