also auto-suggestion, 1879, a hybrid from auto- + suggestion. The idea, and probably the model for the word, originally from French.
autosuggestion au·to·sug·ges·tion (ô'tō-səg-jěs'chən)
n.
The dwelling upon an idea, thought, or concept, thereby inducing some change in the mental or bodily functions.
The process by which a person induces self-acceptance of an opinion, belief, or plan of action.