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a·but·ment / əˈbətmənt/ • n. a structure built to support the lateral pressure of an arch or span, e.g., at the ends of a bridge. ∎  the process of supporting something with such a structure. ∎  a point at which something abuts against something else.

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1. Any solid structure, e.g. pier, which receives the thrust of an arch or vault.

2. Point at which a roof-structure rests on a wall.