SEASONAL
seasonal
(adjective) occurring at or dependent on a particular season; “seasonal labor”; “a seasonal rise in unemployment”
Source: WordNet® 3.1
Etymology
Adjective
seasonal (comparative more seasonal, superlative most seasonal)
Of, related to, or reliant on a season or period of the year, especially with regard to weather characteristics.
Antonym: unseasonal
Noun
seasonal (plural seasonals)
Anything that is seasonal, such as a financial trend, a product for sale, or an employee.
Source: Wiktionary
Sea"son*al, a.
Definition: Of or pertaining to the seasons. 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.
Source: Webster’s Unabridged Dictionary 1913 Edition