important in effect or meaning
"a significant change in tax laws"
"a significant change in the Constitution"
"a significant contribution"
"significant details"
"statistically significant"
having authority or ascendancy or influence
"an important official"
"the captain's authoritative manner"
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"
Having relevant and crucial value.
"The missing data file was important because it contained the only evidence needed to solve the case."
In plain English: Important means something that really matters or makes a big difference.
"She thinks education is very important for her future."
Usage: Use important to describe people, things, or events that have significant influence or value because they are necessary for success or well-being. Avoid using it simply to mean "famous" or "expensive," as true importance lies in relevance rather than popularity or cost.
The word entered English from the French via Medieval Latin, originally meaning "to carry in." It eventually replaced the native Old English terms heah and hefig to describe something of great significance.