1 the meeting place, joint or lap of two adjacent components, parts of construction etc.

2 the planar joint formed by two surfaces or edges placed adjacent to or touching one another. 

3 the meeting of the upper edge or verge of a pitched roof and a balustrade, parapet or upper
wall surface; especially the vertical surface or structure which rises from this.

4 the part of a load bearing system or member from which loads are supported.

5 walling or support on either side of the impost of an arch to prevent it from splaying outwards.

Typical Concrete Abutment

Dead- and Live-Load Action on an Abutment

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