Casual, a.
Etymology: [OE. casuel, F. casuel, fr. L. casualis, fr. casus fall, accident, fr. cadere to fall. See Case.]
1. Happening or coming to pass without design, and without being foreseen or expected; accidental; fortuitous; coming by chance. Casual breaks, in the general system. W. Irving.
2. Coming without regularity; occasional; incidental; as, casual expenses. A constant habit, rather than a casual gesture. Hawthorne.
Syn. -- Accidental; fortutious; incidental; occasional; contingent; unforeseen. See Accidental.
1 other Webster entry under this spelling
Casual, n.
One who receives relief for a night in a parish to which he does not belong; a vagrant.