Resistance (n.) is broadly defined as anything that interrupts the progress of analysis.
Resistance (n.) is, in analysis, not eliminated merely by identifying it. One must allow the patient time to become more conversant with this resistance to 'work through it' to 'overcome' it.
Resistance (n.) is in the conscious and unconscious ego under the sway of the pleasure principle: It seeks to avoid the unpleasure which would be produced by the liberation of the repressed.
Resistance (n.) is something which, only at its height, can the analyst discover the repressed impulses feeding it.
Resistance (n.) shrinks in proportion to the truths you sacrifice — so a theory that meets less of it has nothing to boast of.