auto-, aut-

(Greek: self, same, spontaneous; directed from within)

ambulatory automatism (s) (noun), ambulatory automatisms (pl)
Aimless wandering or moving around: "The ambulatory automatism of a person includes the performance of mechanical acts without any conscious awareness of doing such movements."

"During ambulatory automatisms, epileptic patients walk around and are able to carry out some functions without being clearly conscious of either themselves or their surroundings."

autacoid (s), autacoids (pl) (nouns)
An organic substance formed by cells of an organ and carried by the circulatory system to a remote site where it affects another organ.
autacoidal (adjective)
A reference to an organic substance; such as, a hormone, produced in one part of an organism and transported by the blood, lymph, or sap to another part of the organism where it exerts a physiological effect on that part.
autaesthesy, autesthesy (s) (noun); autaesthesies, autesthesies (pl)
A feeling of self-consciousness: "Barbara thought she was overdressed for the occasion and as a result, she experienced acute autaesthesy."
A sexual perversion in which sexual arousal and orgasm are contingent upon displaying one’s self in a live show, i.e. being observed performing on stage or on camera.

The observer’s condition (if the stage or camera performance by the partner is a necessity for sexual arousal) is termed scoptophilia, [scopophilia], not voyeurism.

Psychiatric Dictionary, 7th ed., by Robert J. Campbell]
A word that means its opposite.

An example is the word fast, which when referring to a fast runner means a runner who runs rapidly or swiftly; but when it refers to a fast color, it means a color that doesn't run at all.

Based on information from Word and Phrase Origins

The scientific study of natural immunity.
Natural immunity.
An absolute ruler; autocrat; a tyrant.
1. Absolute sovereignty, despotism.
2. Self-government; an autocratic government by one person with unlimited authority over others.
Someone who rules a nation that has a policy of economic independence.
autarky, autarkic, autarkical
1. The condition of self-sufficiency; especially, economic, as applied to a nation.
2. A national policy of economic independence.
Stage-managing one’s own murder, reported as an extreme form of masochism.
Stage-managing one’s own murder, reported as an extreme form of masochism.
An instrument for self-auscultation.

Inter-related cross references, directly or indirectly, involving word units dealing with "equal, identical, same, similar": emul-; equ-, equi-; homeo-; homo-; iso-; pari-; peer; rhomb-; syn-; tauto-.