What is the meaning of paradigm?

noun

• Systematic arrangement of all the inflected forms of a word.
• A standard or typical example.
  • usage: "he is the prototype of good breeding"; "he provided America with an image of the good father"
  • synonyms: prototype, epitome, image
• The class of all items that can be substituted into the same position (or slot) in a grammatical sentence (are in paradigmatic relation with one another.
  • synonyms: substitution class
• The generally accepted perspective of a particular discipline at a given time.
  • usage: "he framed the problem within the psychoanalytic paradigm"