Dictum is from Latin dictum ('something said, a saying'), the neuter past participle of dicere ('to say, speak'), used as a noun. The ancestry passes through Latin dictum, Latin dicere, and Proto-Indo-European *deyḱ-. In present use as a noun, it means "a formal pronouncement or an authoritative saying", keeping the historical formation close to the word's ordinary semantic work. Related words include diction, dictate, dictator, and dictionary; derived forms include dicta. The surrounding word family keeps the same base visible in dicta, diction, dictate, dictator, and dictionary, showing how the headword belongs to a larger cluster rather than standing alone.