1. system

noun (common) (futsuumeishi)

2. lineage, ancestry, family line

noun (common) (futsuumeishi)

3. group (e.g. of colors) (colours), family (e.g. of languages), party, school (of thought)

noun (common) (futsuumeishi)

4. close (evolutionary) relationship

noun (common) (futsuumeishi)

5. a population sharing a common ancestor (in genetics), strain (e.g. bacterial)

noun (common) (futsuumeishi)