per ‧ chance /pəˈtʃɑːns $ pərˈtʃæns/ BrE AmE adverb old use or literary
[ Date: 1300-1400 ; Language: Old French ; Origin: per chance 'by chance' ]
1 . perhaps:
One day perchance I shall tell you.
2 . by chance:
Leave now, lest perchance he find you.