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I think it represents the energy that is released if the intermolecular force is broken. The value is negative because energy is being released rather than stored up as potential energy. The largest negative value is in the ion-ion interaction because a cation and anion will have a large attraction due to electron pull, meaning it stores the most potential energy in its attraction.
For example, a hydrogen bond would have an energy of a greater magnitude (a larger negative number) because they are much stronger and require much more energy to break than a dipole-dipole interaction.
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