a possibility of something happening

there is a chance of winning the raffle

there is little chance of his finding a job

the occurrence of events in the absence of any obvious intention or cause

he met his brother by chance

fortuitous; accidental

a chance meeting

do something by accident or without intending to

he was very effusive if they chanced to meet

do (something) despite its being dangerous or of uncertain outcome

they chanced a late holiday