正せい系けい

noun

legitimate line; direct descent

Refers to a genealogical or organizational line that is considered the proper, unbroken, or main branch, as opposed to a collateral or illegitimate one. Often used in historical, family, or institutional contexts.

• 彼かれはその名めい家かの正せい系けいの子し孫そんだと主しゅ張ちょうしている。

  He claims to be a descendant of the legitimate line of that distinguished family.

• この流りゅう派はの正せい系けいは江え戸ど時じ代だいから続つづいている。

  The direct descent of this school has continued since the Edo period.