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- (acoustics) A natural periodicity, or the reinforcement associated with this periodicity.
- (chemistry) The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.
- (electronics) A condition where a system is tuned to a specific frequency. A circuit where XL is equal and opposite to XC; hence, their effects cancel, leaving only R.
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