1. Two times
   "I called her twice" 
2. To double the degree
   - doubly, double

Encyclopedia: Twice

• buy in
• buy into
• buy it
• buy off
• buy the farm
• buy time
• buy up
• buy-and-bust operation
• buyback
• buyer
• buyers' market
• Buyi
• buying
• buyout
• buyout bid
• buzz
• buzz bomb
• buzz off
• buzz saw
• buzzard
• Buzzards Bay
• buzzer
• buzzing
• buzzword
• BVD