1. Sufficiently significant to affect the whole world
   "the conversation...could hardly be called world-shattering"
   - earthshaking, world-shaking, earth-shattering

See also: important, significant

• Mrs. Gandhi
• Mrs. Henry Wood
• Mrs. Humphrey Ward
• Mrs. Simpson
• MRSA
• MRTA
• ms
• MS-DOS
• msasa
• MSB
• MSc
• msec
• MSG
• MSH
• MST
• Mt
• Mt Etna
• Mt Orizaba
• Mt. Ararat
• Mt. Everest
• Mt. McKinley
• Mt. Olympus
• Mt. Ranier
• Mt. Rushmore
• Mt. St. Helens