Something that forms or makes up a whole together with another element; a joint component or part.
From 'co-' (together) plus 'constituent' (from Latin constituens, meaning component or element). Used in chemistry, grammar, and other fields to describe equally important parts of a whole.
In chemistry, oxygen and hydrogen are coconstituents of water—neither one is more important, and you need both for the molecule to exist. It's a perfect example of how true partnership works in nature.
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