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Comprehensive
Dictionary Suite
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changeless unchanging, invariable, or immutable; constant.
constancy the quality of being constant or invariable, as in purpose, opinion, or devotion; steadfastness; loyalty. [1/2 definitions]
invariable that which is constant or invariable. [1/2 definitions]
pitch pipe a small musical pipe or pipes with invariable pitch, used as a tuning standard by singers and other musicians.