important in WordNet English dictionary

1. having authority or ascendancy or influence
   "an important official"; "the captain's authoritative manner"
   authoritative  important 
   
2. of extreme importance; vital to the resolution of a crisis
   "a crucial moment in his career"; "a crucial election"; "a crucial issue for women"
   crucial  important 
   
3. of great significance or value
   "important people"; "the important questions of the day"
   important  of import 
   
4. important in effect or meaning
   "a significant change in tax laws"; "a significant change in the Constitution"; "a significant contribution"; "significant details"; "statistically significant"
   significant  important 
   
5. 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"
   important