A former U.S. 4-star General, when reporting on one of his last assignments as a commander, he always uses this phrase: "propaganda and desinformation". Well, this retired officer was at one time the commander of the "United States Army Civil Affairs and Psychological Operations Command (Airborne) (USACAPOC(A))", psychological warfare .
The mission in the command owns words: "Psychological Operations are a vital part of the broad range of U.S. political, military, economic, and ideological activities used by the U.S. government to secure national objectives. PSYOP is the dissemination of truthful information to foreign audiences in support of U.S. policy and national objectives.
Used during peacetime, contingencies, and declared war, these activities are not a form of force, but are force multipliers that use nonviolent means in often violent environments. Persuading rather than compelling physically, they rely on logic, fear, desire or other mental factors to promote specific emotions, attitudes or behaviors. The ultimate objective of U.S. military psychological operations is to convince enemy, neutral, and friendly nations and forces to take action favorable to the United States and its allies.
Psychological operations support national security objectives at the tactical, operational and strategic levels of operations."
Globalsecurity.org let us know: "The cornerstone of PSYOP is truth, credibly presented to convince a given audience to cease resistance or take actions favorable to friendly forces. During Desert Storm, the effective use of PSYOP was a combat multiplier that directly contributed to the surrender of thousands of Iraqi soldiers. It is clear its effectiveness saved countless coalition and Iraqi lives."
Finally, however, I think the general's own words meet what psych. ops are about: propaganda.