in the 25 instances of "coerc" in the April 2009 Report linked in this thread, or in the 147 instances of "coerc" found in the "prequel" December 2006 Educing Information Report (several threads have discussed it), a precise, overall definition of "coercive" interrogation techniques.

The 2006 report discusses various "coercive" methods; and so, provides a better feel for that term than the 2009 report.

That being said, the best definition (by examples) of "coercive" interrogation is found in the so-called KUBARK Interrogation Manual (ToC snip):

IX. THE COERCIVE COUNTERINTELLIGENCE INTERROGATION OF RESISTANT SOURCES 82-104

A. Restrictions 82
B. The Theory of Coercion 82-85
C. Arrest 85-86
D. Detention 86-87
E. Deprivation of Sensory Stimuli 87-90
F. Threats and Fear 90-92
G. Debility 92-93
H. Pain 93-95
I. Heightened Suggestibility and Hypnosis 95-98
J. Narcosis 98-100
K. The Detection of Malingering 101-102
L. Conclusion 103-104
The 2009 report cites KUBARK nada; the 2006 report cites it 125 times and has a separate chapter devoted to it:

5. KUBARK Counterintelligence Interrogation Review:
Observations of an Interrogator – Lessons Learned and Avenues for Further Research, Steven M. Kleinman, p. 95
I'm positing you are looking for a legal-neutral definition of "coercive" and "non-coercive" interrogation - if so, look to KUBARK (snip from ch IX):

L. Conclusion

A brief summary of the foregoing may help to pull the major concepts of coercive interrogation together:

1. The principal coercive techniques are arrest, detention, the deprivation of sensory stimuli, threats and fear, debility, pain, heightened suggestibility and hypnosis, and drugs.

2. If a coercive technique is to be used, or if two or more are to be employed jointly, they should be chosen for their effect upon the individual and carefully selected to match his personality.

3. The usual effect of coercion is regression. The interrogatee's mature defenses crumbles as he becomes more childlike. During the process of regression the subject may experience feelings of guilt, and it is usually useful to intensify these.

4. When regression has proceeded far enough so that the subject's desire to yield begins to overbalance his resistance, the interrogator should supply a face-saving rationalization. Like the coercive technique, the rationalization must be carefully chosen to fit the subject's personality.

5. The pressures of duress should be slackened or lifted after compliance has been obtained, so that the interrogatee's voluntary cooperation will not be impeded.
We could, of course, spend a lot of fruitless and useless bytes talking about the evidentiary admissibility of "coerced" statements, and various aspects of the exclusionary rule and the fruit of the poisoned tree rule. I don't feel like doing that right about now.

Regards

Mike