Etymology
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schema (n.)

plural schemata, 1796, in Kantian philosophy ("a product of the imagination intermediary between an image and a concept"), from Greek skhēma "figure, appearance, the nature of a thing," which is related to skhein "to get," and ekhein "to have, hold; be in a given state or condition" (from PIE root *segh- "to hold"). The meaning "diagrammatic representation" is from 1890; the general sense of "hypothetical outline" is by 1939.

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Definitions of schema

schema (n.)
an internal representation of the world; an organization of concepts and actions that can be revised by new information about the world;
Synonyms: scheme
schema (n.)
a schematic or preliminary plan;
Synonyms: outline / scheme
From wordnet.princeton.edu