Final answer:
Psychological warfare propaganda involves the manipulation and employment of language and symbols to influence public opinion or behavior in a specific direction.
Step-by-step explanation:
Daniel Lerner's definition of psychological warfare propaganda is that it refers to the manipulation and employment of language and symbols in the service of an ideological or social purpose. It involves the use of communication techniques to shape people's beliefs, attitudes, and behaviors, often with the goal of influencing public opinion or behavior in a specific direction. Psychological warfare propaganda can be used by governments, organizations, or individuals to achieve their objectives.