Relating to or resembling summer; of or pertaining to the season of summer; summery.
From Latin 'aestivus' (of summer). This is a less common variant of 'estival,' both deriving from the same Latin root 'aestivus,' which is itself built from 'aestas' (summer).
Many English adjectives about seasons come from Latin—'estive/estival,' 'hibernal,' 'vernal,' 'autumnal'—showing how deeply classical languages shaped how we talk about time.
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