The pivot point on which a lever turns or is supported; the point of balance. Metaphorically, the crucial element on which something depends or turns.
From Latin fulcrum meaning 'bedpost, support,' derived from fulcire 'to prop up or support.' Archimedes popularized the mechanical concept, and the word entered English scientific vocabulary in the 17th century through translations of classical texts on mechanics.
Fulcrum carries Archimedes' famous boast 'Give me a lever long enough and a fulcrum on which to place it, and I shall move the world,' making it a word that embodies both physical law and human ambition. The metaphorical use is remarkably apt - in any situation, finding the fulcrum point really can move mountains, whether in mechanics, politics, or personal relationships.
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