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Origin and history of substratum
substratum(n.)
"that which is laid or spread under," originally in theology and metaphysics, 1630s, from Modern Latin substratum (plural substrata), noun use of neuter singular past participle of Latin substernere "to spread underneath," from sub "under, below, beneath" (see sub-) + sternere "to spread out, lay down, stretch out" (from nasalized form of PIE root *stere- "to spread").
Of material situations, "anything that underlays" (1670s); in agriculture, "subsoil." In linguistics by 1922 in reference to elements of a mother tongue carried into a different language by people who adopt one in place of the other. Compare stratum.
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