1.Definition: having authority or ascendancy or influence

"An important official"

Related Adjective(s):authoritative

2.Definition: having or suggesting a consciousness of high position

"Recited the decree with an important air", "Took long important strides in the direction of his office"

3.Definition: important in effect or meaning

Related Adjective(s):significant

4.Definition: of extreme importance; vital to the resolution of a crisis

Related Adjective(s):crucial

5.Definition: of great significance or value

"Important people", "The important questions of the day"