Here is his definition of technopoly: "the submission of all forms of cultural life to the sovereignty of technique and technology."

According to Postman, here are some of the assumptions of technopoly:
The primary, if not the only, goal of human labor and thought is efficiency.
Technical calculation is in all respects superior to human judgment.
Human judgment cannot be trusted because it is plagued by laxity, ambiguity, and unnecessary complexity.
What cannot be measured either does not exist or is of no value.
The affairs of citizens are best guided and conducted by experts.

A YouTube video of Postman giving a lecture