quintade

Blend of quint- (“five”) and decade (“10-year period”).

quintade (plural quintades)

1. Synonym of pentad: A 5-year period, particularly in reference to the first and second halves of calendrical decades.
   • 1833, Edinburgh Medical and Surgical Journal - Volume 40 - Page 368:

     Thus it appears, that the greatest number of cases of uterine cancer occurs between the ages of 30 and 40, and 40 and 45; that nearly equal numbers take place in the first decade, and the latter quintade; that, nevertheless, if the quintades of the latter decade be conjoined, very nearly double the number (201) take place in the decade between 40 and 50, of that which takes place in the decade between 30 and 40; that next to the decade between 20 and 40, that between 20 and 30 is most liable; yet that this does not approach the quintade between 45 and 50; that below the age of 20 the frequency of uterine cancer varies from on-eighth to one-ninth of that of other periods; that after 50 it is about one-fifteenth; and that after 60 it is so low as a twenty-fifth or twenty-sixth.

   • 1868, The National Quarterly Review - Volume 16, page 272:

     The number of deaths by each of these is set down in parallel columns for different ages from one year up to five, and in quintades, from five to a hundred.

   • 2009, D Painter, “Are biofuels the future or a folly?: A review”, in New Zealand Journal of Forestry, volume 53, number 4, page 16:

     It promises to be valuable for petrol blends early in the 2009-2013 quintade, particularly if whey bioethanol production falls short of demand.

   • 2016 March, G Krampen, “Scientometric trend analyses of publications on the history of psychology: Is psychology becoming an unhistorical science?”, in Scientometrics, volume 106, number 3:

     For 5-year-intervals (referred to in the following as “quintades” in analogy to decades) there is a marked drop of absolute and relative publications frequencies since the 1990s with a maximum of 4.2 % in the quintade 1985–1989 and the minimum of 1.6 % in 2010–2014 (see Fig. 1).

• antiqued, quainted