A system or practice of cooperation between two opposing political parties or factions, or the principle of sharing power equally between two sides.
From bipartisan (two-party) + -ism (system or belief). Bipartisan itself comes from bi- (two) + partisan (member of a party). The suffix -ism makes it a system or ideology rather than just the quality.
Bipartisanism has shaped many democracies—the U.S. government was literally designed for it, with Democrats and Republicans theoretically checking each other's power!
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