something in which one is interested or which is important
business, responsibility
Cases of word usage
1) a mental illness with anxiety, excited behaviour, abnormal concern etc caused by disorders of the nervous system or by something in the subconscious mind (neurosis)
2) of a profession; doing something in a way hat shows care or concern (professional)
3) anxious to help, showing concern (for a person, thing) (solicitous)
4) concern or anxiety (solicitude)
5) having, showing, no interest; having no personal concern in something (uninterested)