In medicine, agenesis refers to the failure of an organ to develop during embryonic growth and development. Many forms of agenesis are referred to by individual names, depending on the organ affected:

• Agenesis of the corpus callosum- failure of the Corpus callosum to develop.
• Renal agenesis- failure of one or both of the kidneys to develop.
• Phocomelia- failure of the arms or legs to develop.
• Penile agenesis- failure of penis to develop.

In theology, agenesis means to have no beginning or to have no creator, to come into existence without the influence of an outside intelligence.

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