Definition of prochain ami in US English:

prochain ami

(also prochein amy, prochein ami)

noun

  • A next friend; a person who is entitled to act on behalf of an infant, a person lacking the mental capability to act for themselves, or a married woman (now chiefly US).

Origin

Late 15th century. From Anglo-Norman prochein ami person who is entitled to act on behalf of an infant in litigation from prochain + ami.