Etymology
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grounding (n.)

late 14c., "action of establishing," verbal noun from ground (v.). Meaning "instruction in fundamentals" is from 1640s. Sense of "background of a design" is from 1882.

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Definitions of grounding

grounding (n.)
education or instruction in the fundamentals of a field of knowledge;
a good grounding in mathematics
Synonyms: foundation
grounding (n.)
fastening electrical equipment to earth;
Synonyms: earthing
From wordnet.princeton.edu