Definition of "thirties"

thirties

noun
1. plural of thirty
noun
plural only
1. A decade starting with the year xx30, most usually the decade from 1930 to 1939.
  Quotations
  The Road to Glory, while not the best, was likewise not the least of the thirties films which may justly be called "anti-war" in both intent and execution.
  1975, Michael T. Isenberg, “An Ambiguous Pacifism: A Retrospective on World War I Films, 1930–1938”, in Journal of Popular Film, volume 4, number 2, page 109
2. The decade of one's life from age 30 through age 39.
3. (temperature, rates) The range between 30 and 39.
adjective
not comparable
1. From or evoking the 31st through 40th years of a century (chiefly the 1930s).
  Quotations
  'Something light and airy for this last burst of summer, non?' said Madame, and held up a dress in creamy pink crêpe-de-Chine. 'Very thirties, n'est-ce pas? I adore this fabric—so fluid, so graceful.'
  1990, Catherine George, Come Back to Me, Harlequin Books, page 58