系統けいとう

1. 1system
2. 2lineage ; ancestry ; family line
3. 3group (e.g. of colors) (colours) ; family (e.g. of languages) ; party ; school (of thought)
4. 4close (evolutionary) relationship
5. 5a population sharing a common ancestor (in genetics) ; strain (e.g. bacterial)

JMdict entry 1251030 · frequency rank 10. Source and licence.