Happening or coming to pass without (apparent) cause, without design on the part of the agent, in an unaccountable manner, or as a mere coincidence or accident; coming by chance; accidental; fortuitous; indeterminate: as, a casual encounter.Occasional; coming at uncertain times, or without regularity, in distinction from stated or regular; incidental: as, casual expenses.n. A person who receives relief and shelter for one night at the most in a workhouse or police-station, or who receives treatment in a hospital for an accidental injury.n. A laborer or an artisan employed only irregularly.