1.
doctrine, principle, belief
A system of beliefs or principles that guide behavior or thought.
自分の主義を貫く。
To stick to one's principles.
主義を貫く = to hold firm to one's principles
彼の主義には賛成できない。
I can't agree with his principles.
主義主張が違っても、お互いを尊重することが大切だ。
Even if our principles and claims differ, it's important to respect each other.
2.
-ism (suffix)
Used as a suffix to form words meaning a particular ideology or movement.
彼は完璧主義だ。
He is a perfectionist.
資本主義と社会主義の違いを学ぶ。
To learn the difference between capitalism and socialism.
彼女は菜食主義で、肉や魚を一切食べない。健康のためというより、動物愛護の信念からだそうだ。
She's a vegetarian and doesn't eat any meat or fish. She says it's not for health reasons, but from a belief in animal welfare.
主義 means a doctrine, principle, or -ism. It's often used as a suffix.
AS A SUFFIX (○○主義):
- 資本主義 (capitalism)
- 社会主義 (socialism)
- 民主主義 (democracy)
- 個人主義 (individualism)
- 完璧主義 (perfectionism)
- 菜食主義 (vegetarianism)
- 楽天主義 (optimism)
- 悲観主義 (pessimism)
AS A NOUN:
- 主義主張 (principles and claims)
- 主義を貫く (to stick to one's principles)
RELATED SUFFIX:
- ○○主義者 (an -ist): 社会主義者 (socialist)