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stratum 
  n pl , -ta , -tums 
1 usually pl any of the distinct layers into which sedimentary rocks are divided 
2  (Biology) a single layer of tissue or cells 
3 a layer of any material, esp. one of several parallel layers 
4 a layer of ocean or atmosphere either naturally or arbitrarily demarcated 
5 a level of a social hierarchy that is distinguished according to such criteria as educational achievement or caste status 
  (C16: via New Latin from Latin: something strewn, from sternere to scatter) 
 stratal  adj 


stratum title 
  n  the N.Z. name for   strata title 



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