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initial cause(expression, reason, importance, significance)
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issue main reason(expression, reason, importance, significance)
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key aspect(expression, reason, importance, significance)
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key condition(expression, reason, importance, significance)
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key element(expression, reason, importance, significance)
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key enabler(expression, reason, importance, significance)
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key idea(expression, reason, importance, significance)
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key pillar(expression, reason, importance, significance)
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key player(expression, reason, importance, significance)
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key question(expression, reason, importance, significance)
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key reason(expression, reason, importance, significance)
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knockout punch(expression, reason, importance, significance)
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main cause(expression, reason, importance, significance)
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main condition(expression, reason, importance, significance)
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main criterion(expression, reason, importance, significance)
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main culprit(expression, reason, importance, significance)
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main reason(expression, reason, importance, significance)
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major asset(expression, reason, importance, significance)
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major cause(expression, reason, importance, significance)
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major concern(expression, reason, importance, significance)
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APASmart Define. (2015). fundamental principle thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/fundamental_principle/thesaurus/synonyms
ChicagoSmart Define. 2015. "fundamental principle thesaurus" https://smartdefine.org/fundamental_principle/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, fundamental principle thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/fundamental_principle/thesaurus/synonyms>.
MLASmart Define. "fundamental principle thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/fundamental_principle/thesaurus/synonyms>