Later in age, time, etc.; subsequent.

Puny; petty; unskilled.

Younger or inferior in rank; junior; associate; as, a chief justice and three puisne justices of the Court of Common Pleas; the puisne barons of the Court of Exchequer.

One who is younger, or of inferior rank; a junior; esp., a judge of inferior rank.

Junior or lower in rank, as opposed to the chief justice. For example, there are 8 puisne judges on the Supreme Court of Canada and a chief justice.

Puisne (from Old French puisne, modern puîné, later born, inferior; Lat. postea, afterwards, and natus, born) is a term in law meaning " inferior in rank." It is pronounced "puny," and the word, so spelled, has become an ordinary adjective meaning weak or undersized.