1. involving or composed of two parties, groups, or factions
Usage: often used in political contexts

Examples

• The biparty system in the United States features Democrats and Republicans.
• A biparty agreement was reached between the two labor unions.
• The biparty structure of the legislature made compromise necessary.
• Many countries have moved away from a strict biparty model.
• The biparty negotiations lasted several weeks before a deal was finalized.