puisne /ˈpjuːni/adjective 4noun 1forms 3 adjective4 •Coming later in time; subsequent, secondary. •Inferior in rank, as designation of any justice, judge etc. other than the most senior. •(no longer used) Younger; junior. •(no longer used) Insignificant, petty; ineffectual.it is not conceptible that in an infinite , or indeed in a very long period of Revolutions of Mankind , those or any things of this kind discoverable would have been of so late a puisne a discovery — 1677 noun1 •A person of puisne rank. formspuisnes · more puisne · most puisne