What is the meaning of Linchpin?

(n.) A pin used to prevent the wheel of a vehicle from sliding off the axletree.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). linchpin. Retrieved September 24, 2026, from http://smartdefine.org/linchpin/definitions/2028044
ChicagoWebster's. 2011. "linchpin" http://smartdefine.org/linchpin/definitions/2028044 (accessed September 24, 2026).
HarvardWebster's 2011, linchpin, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/linchpin/definitions/2028044>.
MLAWebster's. "linchpin" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/linchpin/definitions/2028044>
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