Definition of pediment
1
: a triangular space that forms the gable of a low-pitched roof and that is usually filled with relief sculpture in classical architecture
also
: a similar form used as a decoration
2
: a broad gently sloping bedrock surface with low relief that is situated at the base of a steeper slope and is usually thinly covered with alluvial gravel and sand
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Merriam-Webster unabridged
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Time Traveler for pediment
The first known use of pediment was in 1664
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