Tallness
/ˈtɔːlnəs/
Definition 1 of 1
Pro Tip 1/3Physical Impression
Tallness often conveys a strong physical presence. 
His tallness adds to his commanding figure.
Pro Tip 2/3Relative Measure
Use 'tallness' to compare height among people or objects. 
The tallness of the new building dominates the skyline.
Pro Tip 3/3Not Absolute
'Tallness' is relative; someone may be tall in one group but not in another. 
In his hometown, his tallness is less remarkable.