Definitions of ear:

• noun:   the sense organ for hearing and equilibrium
• noun:   good hearing

  Example: "He had a keen ear"

• noun:   attention to what is said

  Example: "He tried to get her ear"

• noun:   fruiting spike of a cereal plant especially corn
• noun:   the externally visible cartilaginous structure of the external ear
• name:  A surname (very rare: popularity rank in the U.S.: #38125)