Movement of the axon membrane potential from -70 mv to -90 mv would be termed hyperpolarization.
The word "hyperpolarization" is used to describe a procedure or action that makes a cell's membrane potential more negative than it usually is. When the plasma membrane is polarized, electrical charges of both the positive and negative types are present.
A cell, more precisely a neuron, has a negative membrane potential in relation to its surroundings. Because there are more negative ions (like Cl-) inside the cell, the cell may maintain a moderately negative electrical charge. A neuron's resting potential would typically be about -70 mV.
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