1. At the proper time
   "she was duly apprised of the raise"
   - punctually 
2. In a due, fit, or becoming manner; as it ought to be; properly

See also: due

• cell death
• cell division
• cell doctrine
• cell membrane
• cell nucleus
• cell organ
• cell organelle
• cell theory
• cell wall
• cell-free
• cell-like
• cell-mediated immune response
• cella
• cellar
• cellarage
• cellaret
• cellblock
• celled
• Cellini
• cellist
• cellmate
• cello
• cellophane
• cellphone
• cellular