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

Encyclopedia: Perchance

• selenide
• Selenipedium
• selenite
• selenium
• selenium cell
• seleno-
• selenographer
• selenography
• selenolatry
• selenology
• Seles
• Seleucus
• Seleucus I
• Seleucus I Nicator
• self
• self acceptance
• self-abasement
• self-abnegating
• self-abnegation
• self-absorbed
• self-absorption
• self-abuse
• self-accusation
• self-acting
• self-activating