Relating to or suitable for a festival, celebration, or feast; festive and celebratory in nature.
From Latin 'festivus' (festive) combined with Old French influences, the word entered Middle English to describe anything appropriate for a festival or celebration.
While 'festive' became the common English word, 'festal' survived in more formal or poetic contexts—you might read about a 'festal hall' in literature even though nobody says 'festal decorations' in everyday speech.
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