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

Encyclopedia: Twice

• forthcoming
• forthcomingness
• forthright
• forthrightly
• forthrightness
• forthwith
• forties
• fortieth
• fortification
• fortified
• fortified wine
• fortifier
• fortify
• fortis
• fortissimo
• fortitude
• fortnight
• fortnightly
• Fortran
• Fortran compiler
• FORTRAN program
• fortress
• fortuitous
• fortuitously
• fortuitousness