noun
chivalrous spirit; righteous heart
A somewhat literary or formal term for a spirit of justice, loyalty, and moral integrity, often associated with samurai ideals.
彼の義心に満ちた行動は多くの人を感動させた。
His actions, full of chivalrous spirit, moved many people.
Compound of 義 (righteousness, justice) and 心 (heart, spirit). The exact historical derivation is uncertain, but it likely emerged in literary or moral contexts to describe a virtuous inner disposition.