(Greek: a suffix; pertaining to; of the nature of, like; in chemistry, it denotes a higher valence of the element than is expressed by -ous)

1. Self-generation.
2. Origination within the organism.
1. Occurring within a given system.
2. Produced by the activities of living organisms within a system and acting upon that system.
Dependent upon the presence of autologous blood.
Of or relating to voluntary activity or movement.
That which breaks down plant or animal tissue by the action of enzymes within the tissue that is affected.
Learning acquired by oneself.
1. Acting or operating in a manner essentially independent of external influence or control; such as, an automatic light switch; a budget deficit that triggered automatic spending cuts.
2. Self-regulating; for example, an automatic washing machine.
3. Acting or done without volition or conscious control; involuntary; spontaneous; for example, automatic shrinking of the pupils of the eyes in strong light.
4. Acting or done as if by machine; mechanical; such as, an automatic reply to a familiar question.
5. Capable of firing continuously until ammunition is exhausted or the trigger is released; as with, an automatic rifle.
6. Semiautomatic; an automatic pistol.
"Automatic" simply means that you can't repair it yourself.
—Mary H. Waldrip

The words automatic pilot or automatic transmission bring to mind mechanical devices that operate with minimal human intervention. Yet the word automatic, which goes back to the Greek word automatos, “acting of one's own will, self-acting, of itself,” is made up of two parts, auto-, “self,” and -matos, “willing,” is first recorded in English in 1748 with reference to motions of the body; such as, the peristaltic action of the intestines: “The Motions are called automatic from their Resemblance to the Motions of Automata, or Machines, whose Principle of Motion is within themselves.”

Although the writer had machines in mind, automatic could be used as a reference to living things, a use we still have. The association of automatic chiefly with machinery may represent one instance of many in which we have come to see the world in mechanical terms.

The American Heritage Dictionary of the English Language, Fourth Edition.
Curvature arising from endogenous forces.
Functioning independently of the will; not under voluntary control: a reference to that part of the nervous system that regulates the activities of blood vessels, secretory glands, and viscera. It comprises parasympathetic and sympathetic components.
autopsychic (adjective)
Of or pertaining to self-consciousness or the awareness of oneself.
Pertaining to or of the nature of an autosite.
Relating to or believing in autotelism; being an end in itself.
A poison that acts on the organism in which it is generated.
autotrophic (adjective)
1. Capable of synthesizing complex organic substances from simple inorganic substrates; including both the chemoautotrophic and the photoautotrophic organisms.
2. A reference to any organism for which environmental carbon dioxide is the only or main source of carbon in the synthesis of organic compounds by photosynthesis.
autotropic (adjective), more autotropic, most autotropic
In botany and biology, a reference to the tendency to grow in a straight line, regardless of external factors or influences.