Definition: The word "allogeneity" comes from Greek and means "without" or "in lieu." It refers to a process where two substances combine without forming a new substance, usually with some form of energy released. This could be for example, combining water with soap to make soap, or burning coal to produce electricity. In this context, the word "allogeneity" is used metaphorically to describe the act of adapting or replacing one substance with another that does not change its nature but changes its composition. For instance, a plant might use sunlight and water from the soil to create sugar for human consumption, which would be in lieu of the original tree. In this sense, allogeneic chemistry is akin to genetic engineering, where an organism modifies or replaces itself through biochemical means without changing its fundamental form or properties. This is why allogeneic chemistry has a similar metaphorical meaning as "without" or "in lieu," which is often used in the context of medicine and renewable energy sources.

allogeneity