Which characteristic best defines fascism?

Fascism is best defined by its characteristic of authoritarian ultranationalism with dictatorial power. This ideology is centered on a strong centralized government led by a dictatorial leader who often emphasizes the supremacy of the nation or race over individual rights and freedoms. Fascist regimes typically seek to create a cohesive national identity and enforce conformity to state ideals, often through oppressive means.

The focus on a strong, authoritarian rule reflects the belief that society should be unified under a single national will, often at the expense of democratic institutions and individual liberties. This differs significantly from other ideologies that prioritize individual rights, social democracy, or global cooperation, which are fundamentally opposed to the core tenets of fascism. Fascism's inherent disdain for political pluralism and its aggressive nationalism make the characteristic of authoritarian ultranationalism with dictatorial power its most defining feature.