1.Definition: most powerful or important or influential

"D-day is considered the dominating event of the war in Europe"

Related Adjective(s):ascendant, ascendent

2.Definition: offensively self-assured or given to exercising usually unwarranted power

"A rather aggressive and dominating character"

Related Adjective(s):autocratic, bossy, magisterial, peremptory

3.Definition: used of a height or viewpoint

"Looked up at the castle dominating the countryside"

Related Adjective(s):commanding, overlooking