1. Of great significance or value
   "The discovery was of import to the scientific community";
   - important

See also: all-important, alpha, beta, big, burning, cardinal, central, chief, consequential, Copernican, crucial, distinguished, essential, eventful, fundamental, grand, grave, great, grievous, heavy, historic, importance, importancy [archaic], important, in-chief, key, main, master, measurable, most-valuable, of the essence, outstanding, primal, primary, principal, serious, significant, strategic, valuable, weighty