The state or office of being a coelder; joint leadership or shared electorship.
From coelder plus -ship, the English suffix creating nouns denoting offices, relationships, or states of being (as in friendship, leadership, kingdom).
The -ship suffix has been building English nouns for over a thousand years—from 'friendship' to 'championship' to 'citizenship'—proving that one suffix pattern kept working so well that speakers never stopped using it.
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