substration noun. [sǝb'streɪʃ(ǝ)n] M17.
[Late Latin substratio(n-), formed as SUBSTRATE verb: see -ATION.]
1. The prostration before the bishop of the third order of penitents (the prostrators) in the early Church. Also, the place where these penitents knelt. M17-E18.

2. A hypothesis. rare. M19.

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