Precursor

:This article is not about the fictional alien race. See Precursor (Star Control). for that information

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In generic terms, a precursor is something that existed before and was incorporated into something that came later. Also known as a forerunner or predecessor.

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As an example, cacao is a precursor of chocolate. But chocolate is not a precursor of ice cream. There, chocolate is an ingredient.

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Forerunner: :For the ancient alien race in the Halo series, see The Forerunners. For the Dungeons and Dragons race, see Forerunner (Dungeons & Dragons)...

Predecessor: A predecessor can be:...

Cacao: :For the town in French Guiana see Cacao, French Guiana...