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

Encyclopedia: Perchance

• ectasis
• ecto-
• ectoblast
• ectoderm
• ectodermal
• ectodermic
• ectomorph
• ectomorphic
• ectomorphy
• ectoparasite
• ectopia
• ectopic
• ectopic gestation
• ectopic pregnancy
• Ectopistes
• Ectopistes migratorius
• ectoplasm
• ectoproct
• Ectoprocta
• ectotherm
• ectothermic
• ectozoan
• ectozoon
• ectrodactyly
• ectropion