We found one dictionary that defines the word solemn observance:

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1. solemn observance: Legal dictionary

▸ Words similar to solemn observance ▸ Usage examples for solemn observance ▸ Idioms related to solemn observance ▸ Wikipedia articles (New!) ▸ Words that often appear near solemn observance ▸ Rhymes of solemn observance ▸ Invented words related to solemn observance