base
US /beɪs/
UK /beɪs/

1.
the lowest part or edge of something, especially the part on which it rests or is supported
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The statue stood on a marble base.
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He painted the wall with a white base coat.
2.
a conceptual or structural starting point for something
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The research provides a solid base for future studies.
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His argument had no factual base.
3.
a military station or camp
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The soldiers returned to their base after the mission.
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The air force has several overseas bases.
1.
lacking moral principles; ignoble or despicable
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His actions were utterly base and selfish.
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He was accused of committing a base act.