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

• a la mode
• A level
• a little
• a lot
• a million times
• a month of Sundays
• a posteriori
• a priori
• A road
• a trifle
• A'man
• A-bomb
• A-frame
• A-horizon
• A-list
• a-ok
• a-okay
• A-one
• A-scan ultrasonography
• A-team
• A. A. Michelson
• A. A. Milne
• A. Conan Doyle
• A. E. Burnside
• A. E. Housman