The act of making something up or forming it; being the essential elements that together create something.
Present participle of 'constitute,' from Latin 'constituere' (con- + statuere, to cause to stand, set up). The '-ing' ending creates both the active verb form and can function as a gerund (noun) or adjective.
When you say 'the twelve jurors constituting the jury,' you're describing exactly how those people combine to form the whole jury—the word beautifully captures the mathematical idea of things adding up to create a sum!
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