1. To double the degree
   "she was doubly rewarded"
   - double, twice 
2. In a twofold manner
   "he was doubly wrong"
   - in two ways

See also: double

• demotion
• demotivate
• demount
• Dempsey
• demulcent
• Demulen
• demulsify
• demur
• demure
• demurely
• demureness
• demurrage
• demurral
• demurrer
• demy
• demyelinate
• demyelination
• demystify
• demythologisation
• demythologise
• demythologised
• demythologization
• demythologize
• demythologized
• den