Definitions of hear:

• verb:   receive a communication from someone

  Example: "We heard nothing from our son for five years"

• verb:   perceive (sound) via the auditory sense
• verb:   examine or hear (evidence or a case) by judicial process

  Example: "The jury had heard all the evidence"

• verb:   listen and pay attention

  Example: "We must hear the expert before we make a decision"

• verb:   get to know or become aware of, usually accidentally