Instantiation may be

• Philosophy:

• A concept in Platonism, see idea

• Instantiation principle - the idea that if properties exist, the essence that "has" the properties must necessarily exist
• Universal instantiation and existential instantiation, two rules of inference in logic
  • A concept in object-oriented programming, see Instance (programming), object lifetime
• The first moment of existence of a thing, whether living or not. The concept of the big bang theory, at the instant it happened, represents the instantiation of the universe.