What does "terrace" mean?

Additional senses

1. 2.A flat roof to a house; as, the buildings of the Oriental nations are covered with terraces.
2. 3.A street, or a row of houses, on a bank or the side of a hill; hence, any street, or row of houses.
3. 4.(Geol.) A level plain, usually with a steep front, bordering a river, a lake, or sometimes the sea. Note: Many rivers are bordered by a series of terraces at different levels, indicating the flood plains at successive periods in their history. Terrace epoch. (Geol.) See Drift epoch, under Drift, a.
4. 5.To form into a terrace or terraces; to furnish with a terrace or terraces, as, to terrace a garden, or a building. Sir H. Wotton. Clermont's terraced height, and Esher's groves. Thomson.