Technical term in geology for natural fractures in rock along which no movement has occurred. Not used for everyday 'joint' like a body joint or a carpentry joint.
この崖には規則的な節理が見られる。
Regular joints can be seen in this cliff.
Refers to logical coherence, reasonableness, or the underlying principle of something. Often used in contexts discussing whether something makes sense or has a rational basis.
彼の主張には節理がある。
His argument has logic to it.
You should avoid actions that don't make sense.