What is the meaning of procession?

noun

• Theology) the origination of the Holy Spirit at Pentecost. (
  • usage: "the emanation of the Holy Spirit"; "the rising of the Holy Ghost"; "the doctrine of the procession of the Holy Spirit from the Father and the Son"
  • synonyms: emanation, rise
• The group action of a collection of people or animals or vehicles moving ahead in more or less regular formation.
  • usage: "processions were forbidden"
• The act of moving forward (as toward a goal. ).
  • synonyms: progress, progression, advance, advancement, forward motion, onward motion