Black's Law Dictionary (2nd edition)dictionaries

Belligerent

In iuternational lnw. A term used to designate either of two na-tions wbicb are actually in a state of war with each other, as well as thelr allies ac-tively co-operating; as distinguished from a nation which takes no part in the war and maintains a strict indifference as te-tweeu the contending parties, called a “neutral.” TT. S. v. The Ambrose Light (D. C.) 25 Fed. 412; Johnson v. Jones, 44 111. 151, 92 Am. Dec. 159

Source: Black's Law Dictionary 2nd Ed (1910)