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Douglas Harper's Etymology Dictionary
bipartisanship

also bi-partisanship, 1895, from bipartisan + -ship.

Wiktionary
bipartisanship

n. In the context of a two-party system, especially in the United States, cooperation between the competing political party; governing in a bipartisan manner.

Wikipedia
Bipartisanship

Bipartisanship is a political situation, especially in the context of a two-party system, as is the case for countries such as the United States, in which opposing political parties find common ground through compromise, in theory. This is in contrast to partisanship, where an individual or political party only adheres to their interests without compromise. It has been debated among political theorists however that in practice, each party advances their own political agenda at the expense of the other party because of the conflicting ideologies.

Usage examples of "bipartisanship".

I want each of you here to dedicate himself to a new bipartisanship in this country.

In an orgy of bipartisanship, they threw out all their good ideas and joined ranks on the bad ones.