Sacramento UK /ˌsækɹəˈmɛntəʊ/US /ˌsækɹəˈmɛntoʊ/ noun2 •The capital city of California, United States and the county seat of Sacramento County.Police on Monday said they have arrested one man who is a suspect in Sunday’s mass shooting in Sacramento that killed six people and wounded 12 others. — 2022 •A major river in northern California.