Is there another word for bipartisan to mean all parties?

Solution 1:

You could consider cross-party group or cross-party consensus, depending on the context:

Cross-party activities involve two or more political parties. A cross-party group consists of members from two or more political parties.

https://www.collinsdictionary.com/dictionary/english/cross-party

Solution 2:

"Multipartisan" is recognized by some, but not all, dictionaries.

https://www.lexico.com/en/definition/multipartisan

multipartisan (also multipartizan) adjective

Of, representing, or composed of members of more than two (political or other) parties.

Solution 3:

A measure with support from all parties is often called “nonpartisan.” For example, “We’re in political gridlock on partisan issues like X and Y, but at least we can make progress in nonpartisan initiatives like preventing car crashes and pedestrian accidents.”

Merriam Webster: not partisan, especially : free from party affiliation, bias, or designation