Siblinghood

Origin

From sibling + -hood. Compare brotherhood, sisterhood, etc.

Full definition of siblinghood

Noun

1. The state of being a sibling.
• 2008, Theodore Dalrymple, Childhood’s End:She called two of her children with the same father “the twins,” thus transferring the meaning of “twin” from the relatively unusual biological occurrence of double birth to what she clearly thought the equally unusual social circumstance of full siblinghood.