1. plinth, socle, base (a block or slab upon which a column, pedestal, statue or other structure is based) (architecture)

2. baseboard, footing, skirting, skirting board; frieze (architecture)

3. public square, town square, plaza, zocalo (chiefly Mexico City)

4. basement, shelf (mass of rock underlying sedimentary cover) (geology)

5. One endpoint of a two-way connection used for interprocess communication (computing)

6. A type of mechanical connector inside a computer that allows various components to be installed without the need for soldering (computing)