a. Acting of or by one's self or by itself; -- said especially of a machine or mechanism which is made to perform of or for itself what is usually done by human agency; automatic;
n. Action by, or originating in, one's self or itself. [ 1913 Webster ]
a. Acting of one's self or of itself; acting without depending on other agents. [ 1913 Webster ]
n. The quality or state of being self-active; self-action. [ 1913 Webster ]