The lowest part or edge of something, especially the part on which it rests or is supported:
she sat down at the base of a tree
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SYNONYMS
1.1 Architecture The part of a column between the shaft and pedestal or pavement.
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1.2 Botany & Zoology The end at which a part or organ is attached to the trunk or main part:
a shoot is produced at the base of the stem
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1.3 Geometry A line or surface on which a figure is regarded as standing:
the base of the triangle