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pivotal: |
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that vitally effects the activity of development
or course of something. |
Webster's Third New International Dictionary |
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central in importance, function, influence
or effect. |
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central, cardinal, vital |
Shorter
Oxford English Dictionary |
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a person or thing on which something depends
or turns; the central or crucial factor |
The American
Heritage Dictionary of
the English Language, Third Edition. |
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directing
effort to greatest effect |
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