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KEY: Principal.
SYN: Highest, first, main, leading, chief, primary, foremost, pre-eminent, prominent.
ANT: Inferior, subordinate, secondary, supplemental, subject, auxiliary, minor.
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KEY: Principle.
SYN: Source, origin, motive, cause, energy, substance, element, power, faculty, truth, tenet, law, doctrine, axiom, maxim, postulate, rule.
ANT: Exhibition, manifestation, application, development, issue, exercise, operation, formation, action.
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KEY: Prior.