opposer. 1.Intellectual property. One who formally seeks to prevent the grant of a patent or the registration of a trademark. [Cases: Patents  104; Trade Regulation  216. C.J.S. Patents §§ 145–147, 149–151, 173–175; Trade-Marks, Trade-Names, and Unfair Competition§§ 181–182, 184–187.] 2.Hist. APPOSER.

[Blacks Law 8th]