"The frequency of an oscillating system at which the maximum amplitude of oscillation occurs in response to adriving force." 
"The frequency at which resonance occurs in a system. N.B., this and natural frequency are not the same thing, though often used as if synonymous by bio-acousticians... this is the frequency an applied periodic force of minimal value has to have in order to keep the system vibrating. It is clealry higher than the natural frequency." 
- . Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
- . Glossarial Index. Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.
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