- region of central Italy, on the Tyrrhenian Sea: 6,644 sq mi (17,208 sq km); chief city, Rome: It. name Lazio
- ancient country in the part of this region southeast of Rome
Origin of LatiumL: see Latin
- An ancient country of west-central Italy bordering on the Tyrrhenian Sea. It was dominated by Rome after the third century BC.
- See Lazio.