Ground

The word ground has several meanings:

• The surface of the Earth
• Soil, a mixture of sand and organic material present on the surface of the Earth
• Ground (electricity), in electrical engineering, something that is connected to the Earth or at the voltage defined as zero (in the US, called ground; in the UK, called earth)
• In philosophy, socially grounded arguments are those which take as their starting point social conditions.
• In music, a ground bass is a bass part that continually repeats, while the melody and harmony over it change.
• In plants, ground tissue is one of the three types of tissue systems in a plant.