Decades are sometimes subdivided into fractions of 1/10, 1/100 or 1/1000 of a decade. These subdivisions are referred to as decidecade<ref>von Benda-Beckmann, A. M., Aarts, G., Sertlek, H. Ö., Lucke, K., Verboom, W. C., Kastelein, R. A., … & Ainslie, M. A. (2015). Assessing the impact of underwater clearance of unexploded ordnance on harbour porpoises (Phocoena phocoena) in the Southern North Sea. Aquatic Mammals, 41(4), 503.</ref>, centidecade<ref>Ainslie, M. A., Martin, S. B., Trounce, K. B., Hannay, D. E., Eickmeier, J. M., Deveau, T. J., … & Borys, P. (2022). International harmonization of procedures for measuring and analyzing of vessel underwater radiated noise. Marine Pollution Bulletin, 174, 113124.</ref> and millidecade<ref>Martin et al 2021</ref>, respectively.<ref>Ainslie, M. A., Robinson, S. P., & Barham, R. (2025). Fractional octave and fractional decade frequency bands in acoustics: Historical review and recommendations. The Journal of the Acoustical Society of America, 158(4), 3631-3644.</ref>
Decades are sometimes subdivided into fractions of 1/10, 1/100 or 1/1000 of a decade. These subdivisions are referred to as decidecade<ref>von Benda-Beckmann, A. M., Aarts, G., Sertlek, H. Ö., Lucke, K., Verboom, W. C., Kastelein, R. A., … & Ainslie, M. A. (2015). Assessing the impact of underwater clearance of unexploded ordnance on harbour porpoises (Phocoena phocoena) in the Southern North Sea. Aquatic Mammals, 41(4), 503.</ref>, centidecade<ref>Ainslie, M. A., Martin, S. B., Trounce, K. B., Hannay, D. E., Eickmeier, J. M., Deveau, T. J., … & Borys, P. (2022). International harmonization of procedures for measuring and analyzing of vessel underwater radiated noise. Marine Pollution Bulletin, 174, 113124.</ref> and millidecade<ref>Martin 2021</ref>, respectively.<ref>Ainslie, M. A., Robinson, S. P., & Barham, R. (2025). Fractional octave and fractional decade frequency bands in acoustics: Historical review and recommendations. The Journal of the Acoustical Society of America, 158(4), 3631-3644.</ref>
