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(n.) The solid part of a pier or wall, etc., which receives the thrust or lateral pressure of an arch, vault, or strut.
(n.) A fixed point or surface from which resistance or reaction is obtained, as the cylinder head of a steam engine, the fulcrum of a lever, etc.
(n.) That on or against which a body abuts or presses
(n.) State of abutting.
(n.) In breech-loading firearms, the block behind the barrel which receives the pressure due to recoil.
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Webster, Noah. Entry for 'Abutment'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/abutment.html. 1828.