radicalism
The belief in or advocacy of thorough or complete political or social reform, often involving the desire to replace an existing system with a fundamentally different one. / The quality of being extreme or far-reaching in nature, particularly regarding a departure from traditional methods or beliefs.
Noun
This term carries a strong connotation of systemic upheaval and the desire to tear down existing structures to build something entirely new. It is frequently associated with political movements that reject incremental change in favor of a total transformation of the social order.
In a non-political or scientific context, the word shifts toward the concept of departure from tradition or convention. Here, it describes an approach that challenges the very foundations of established thought, often viewed as daring or disruptive by the mainstream community.