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| 1. | an ancient Roman god of doorways, of beginnings, and of the rising and setting of the sun, usually represented as having one head with two bearded faces back to back, looking in opposite directions. |
| 2. | Astronomy. a moon of the planet Saturn, located just outside the rings. |

The Roman god of doors and gateways and hence of beginnings.
Note: Janus was pictured with two faces looking in opposite directions, one young and one old. Consequently, a hypocritical person is often called “Janus-faced.”
Note: The month of January is named after Janus.