1. By chance
   - possibly, perhaps, maybe, mayhap [archaic], peradventure [archaic] 
2. [archaic] Through chance, "To sleep, perchance to dream.."
   - by chance [archaic]

Encyclopedia: Perchance

• DoI
• doily
• Doing Business As
• doings
• DoJ
• DoJC
• dojigger
• dojo
• dol
• dolabrate
• dolabriform
• Dolby
• dolce
• dolce far niente
• doldrums
• dole
• dole bludger
• dole out
• dole queue
• doled out
• doleful
• dolefully
• dolefulness
• dolerite
• dolichocephalic