Refers to logical coherence, rational order, or the reason inherent in things. Often used in formal or philosophical contexts, such as 条理にかなう (to be reasonable) or 条理を尽くす (to exhaust all logical arguments).
Compound of 条 (article, clause, logic) and 理 (reason, principle). The exact historical derivation is uncertain, but the combination conveys a sense of ordered, systematic reason.