What is the meaning of pacing?

noun

• Music) the speed at which a composition is to be played.
  • synonyms: tempo
• Walking with slow regular strides.

verb

• Walk with slow or fast paces.
  • usage: "He paced up and down the hall"
  • synonyms: pace
• Go at a pace.
  • usage: "The horse paced"
  • synonyms: pace
• Measure (distances) by pacing.
  • usage: "step off ten yards"
  • synonyms: pace, step
• Regulate or set the pace of.
  • usage: "Pace your efforts"
  • synonyms: pace