stratum (suomeksi)

kerrostuma (s: erityisesti geotieteissä ja yhteiskuntatieteissä / layer of sedimentary rock having approximately the same composition throughout)
osite (s: tilastotiede / yhteys)
kerros (s: one of several parallel horizontal layers of material arranged one on top of another)
maakerros (s: layer of sedimentary rock having approximately the same composition throughout)
ihokerros (s: layer of tissue)
yhteiskuntaluokka (s: class of society composed of people with similar social, cultural, or economic status)
kansankerros (s: class of society composed of people with similar social, cultural, or economic status)