系けい

noun, noun, used as a suffix

system; lineage; group

Broadly refers to an organized set of related things, a family line, or a group sharing a common characteristic. Often used as a suffix to indicate a category or type.

• 太たい陽よう系けいには8つの惑わく星せいがある。

  There are eight planets in the solar system.

• 彼かれは音おん楽がく家かの系けいに生うまれた。

  He was born into a lineage of musicians.

• この店みせでは和わ食しょく系けいのメニューが豊ほう富ふだ。

  This restaurant has a wide variety of Japanese-style dishes.

noun

corollary

Mathematical term for a proposition that follows directly from a proved theorem.

• この定てい理りの系けいとして、次つぎの結けっ果かが得えられる。

  As a corollary of this theorem, we obtain the following result.

noun, noun, used as a suffix

geological system

In geology, a system is a range of strata corresponding to a particular time period, e.g., the Jurassic system.

• 白はく亜あ系けいの地ち層そうから化か石せきが発はっ見けんされた。

  Fossils were discovered in the Cretaceous system strata.

noun, noun, used as a suffix

taxonomic series

In taxonomy, a series is a rank below section and above species, used in botanical classification.

• この植しょく物ぶつは○○系けいに分ぶん類るいされる。

  This plant is classified in the ○○ series.