The quality or state of being a cousin; the shared characteristics or bonds typical of cousins.
From 'cousin' + '-ness' (state or quality), creating a noun that describes the essence or nature of the cousin relationship, though it's archaic and rarely used in modern English.
Words like 'cousiness' are linguistically possible but rarely used—English speakers just say 'cousin relationship,' showing how potential words often fade away even when grammar would allow them to exist.
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