1. system, lineage, group

noun, used as a suffix noun (common) (futsuumeishi)

2. corollary

noun (common) (futsuumeishi) mathematics

3. system (range of strata that correspond to a particular time period)

noun, used as a suffix noun (common) (futsuumeishi) geology

4. (taxonomical) series

noun, used as a suffix noun (common) (futsuumeishi)