noun
ism
IZ-um/ˈɪzəm/
A distinctive system of beliefs or characteristic attitude.
They discuss the principles of a particular philosophical ism.

Etymology
An ending used to name practices and teachings became a word in its own right. Calling a doctrine an “ism” was chiefly disparaging, treating it as just another system.
More examples
- The essay examines the political isms of the period.
- She refused to reduce her views to a single ism.
- The debate moved from one competing ism to another.
Forms
ism · isms
Similar words
- doctrine
- Doctrine is an organized teaching; ism informally labels a distinctive belief system or attitude.
- ideology
- Ideology is a system of ideas; ism can be a shorthand, sometimes dismissive, for such systems.