IPA: /nɒnˈpɑːtɪzənʃɪp/
KK: /nɑnˈpɑrtɪzənˌʃɪp/
The state of not supporting any political party or group, and being neutral in political matters.
The committee's nonpartisanship allowed it to make fair decisions without bias.
Nonpartisanship → It is formed from "non-" (meaning not) and "partisan" (from Old French *partisan*, meaning a supporter or member of a party). The word refers to the quality of not being affiliated with or supporting any particular political party.
Think of 'not' ('non-') being involved with any 'party' ('partisan') — that's what nonpartisanship means.