Pronunciation: (kazh'OO-ul),[key] —adj. 1. happening by chance; fortuitous: a casual meeting. 2. without definite or serious intention; careless or offhand; passing: a casual remark. 3. seeming or tending to be indifferent to what is happening; apathetic; unconcerned: a casual, nonchalant air. 4. appropriate for wear or use on informal occasions; not dressy: casual clothes; casual wear. 5. irregular; occasional: a casual visitor. 6. accidental: a casual mishap. 7. Obs.uncertain.
—n. 1. a worker employed only irregularly.
2. a soldier temporarily at a station or other place of duty, and usually en route to another station.