Definitions of plant:

• noun:   a living organism lacking the power of locomotion
• noun:   buildings for carrying on industrial labor

  Example: "They built a large plant to manufacture automobiles"

• noun:   something planted secretly for discovery by another

  Example: "The police used a plant to trick the thieves"

• noun:   an actor situated in the audience whose acting is rehearsed but seems spontaneous to the audience
• verb:   place into a river

  Example: "Plant fish"

• verb:   put firmly in the mind

  Example: "Plant a thought in the students' minds"

• verb:   place something or someone in a certain position in order to secretly observe or deceive

  Example: "Plant a spy in Moscow"

• verb:   put or set (seeds or seedlings) into the ground

  Example: "Let's plant flowers in the garden"

• verb:   set up or lay the groundwork for
• verb:   fix or set securely or deeply

  Example: "He planted a knee in the back of his opponent"

• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5729)