Glossary beginning with N
- near field
"The area less than one wavelength from a sound source. In this area pressure and particle velocity are out of phase and sound measurements are unpredictable." 
- . Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
- noise pollution
"Noise pollution refers to the elevation of natural ambient noise levels due to sound-generating human activities, which may have detrimental consequences for humans and animals alike..." 
- . Noise pollution. 2019. Available at: https://linkinghub.elsevier.com/retrieve/pii/S0960982219308632.
- Normal song
See: Calling song