seasonal : Idioms & Phrases
seasonal adjustment
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noun a statistical adjustment made to accommodate predictable fluctuations as a function of the season of the year
- seasonal adjustments for housing starts must be made in mid-winter
WordNet
Seasonal dimorphism
(Zoöl.) , the condition of having two distinct varieties which appear at different seasons, as certain species of butterflies in which the spring brood differs from the summer or autumnal brood.
Webster 1913
seasonal worker
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noun a worker who finds employment only in certain seasons
seasonal.