Definitions of rate:

• noun:   amount of a charge or payment relative to some basis

  Example: "A 10-minute phone call at that rate would cost $5"

• noun:   a magnitude or frequency relative to a time unit

  Example: "They traveled at a rate of 55 miles per hour"

• noun:   the relative speed of progress or change

  Example: "He works at a great rate"

• verb:   be worthy of or have a certain rating

  Example: "This bond rates highly"

• verb:   assign a rank or rating to

  Example: "The restaurant is rated highly in the food guide"

• verb:   estimate the value of

  Example: "How would you rate his chances to become President?"