What does the word main mean?

Usage examples for main

  1. Not until they reached the main road did she trust herself to speak to the dazed lad beside her. – Lucy Maud Montgomery Short Stories, 1902 to 1903 by Lucy Maud Montgomery
  2. Mrs. Wagner entered by the main door, and paused, standing near the fire- place. – Jezebel's Daughter by Wilkie Collins
  3. And the main rockets are off! – Space Tug by Murray Leinster