Of, relating to, or occurring in summer; summery.
From Latin 'aestivalis,' derived from 'aestivus' (of summer), which comes from 'aestas' (summer). This word preserves the classical Latin connection to the season directly.
Latin had separate words for each season built into adjectives—'estival' for summer, 'hibernal' for winter—which shows how Roman writers thought about the seasons as fundamentally different states of being.
Complete word intelligence in one call. Free tier — 50 lookups/day.