1. Vitally important
   "a life-and-death struggle"
   - life-or-death

See also: crucial, important

• Australopithecus afarensis
• Australopithecus africanus
• Australopithecus boisei
• Australopithecus robustus
• Austria
• Austria-Hungary
• Austrian
• Austrian capital
• Austrian monetary unit
• Austrian schilling
• Austrian winter pea
• Austro-Asiatic
• Austro-Asiatic language
• Austrocedrus
• Austrocedrus chilensis
• Austronesia
• Austronesian
• Austronesian language
• Austrotaxus
• Austrotaxus spicata
• autacoid
• autacoidal
• autarchic
• autarchical
• autarchy