[ˈstreɪtəm], (Noun)

Definitions:
- a layer or a series of layers of rock in the ground
(e.g: a stratum of flint)

- a level or class to which people are assigned according to their social status, education, or income
(e.g: members of other social strata)


Phrases:

Origin:
late 16th century (in the sense ‘layer or coat of a substance’): modern Latin, from Latin, literally ‘something spread or laid down’, neuter past participle of sternere ‘strew’