Relating to or appropriate for dinner; characteristic of a dinner meal or dining context.
From dinner + -ly suffix creating an adjective. A less common adjectival formation describing qualities or timing associated with dinner.
Though rarely used in modern English, 'dinnerly' appears in older texts to describe the time of evening when dinner is served or the mood appropriate to dining—it's a word that reflects how much English vocabulary was once organized around meal times and their cultural significance.
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