what is meant by acidic strength of HA?

In HA, H is for hydrogen and A is used as hypothetical acid. Acidic strength of HA means the tendency of HA to lose H+ ions. The more readily it loses H+ more will be the acidic strength.
If HA is strong acid then dissociation will be complete.
HA(aq)  H+(aq) + A-(aq)
For example: Hydrochloric acid
HCl ​(aq)  H+(aq) + Cl-(aq)

If HA is a weak acid then dissociation is not completed an ions remain in equilibrium with acid.
HA(aq)  H+(aq) + A-(aq)
For example, acetic acid
CH3COOH(aq) ​ H+(aq) + CH3COO-(aq)

 

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