Definitions of soil:

• noun:   the part of the earth's surface consisting of humus and disintegrated rock
• noun:   the geographical area under the jurisdiction of a sovereign state

  Example: "American troops were stationed on Japanese soil"

• noun:   material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use)

  Example: "Good agricultural soil"

• noun:   the state of being covered with unclean things
• verb:   make soiled, filthy, or dirty

  Example: "Don't soil your clothes when you play outside!"