king-in-parliament \ˈ ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷ ̷ ̷\noun (pluralkings-in-parliament) Usage: often capitalized K&P : the collective legal entity composed of the British monarch and the two houses of parliament acting together that constitutes the supreme legislative authority of the United Kingdom < the lawmaking function is vested in the king-in-Parliament — F.A.Ogg & Harold Zink >