supertall adjective 2noun 2forms 3 adjective2 •Extremely tall. •Exceeding 984 feet (300 metres) in height. noun2 •A very tall building.As the show suggests, the center of gravity today has shifted from North America and Europe to Asia and the Middle East, where supertalls are rising at a frenetic pace. — 2008 •A building between 300m and 600m tall, approximately 1000ft to 2000ft tall. A tall building taller than a plain tall but shorter than a megatall. formssupertalls · more supertall · most supertall