an activity by which one earns a living
an activity in which one engages
‘I must admit I smoke.’ ‘I am glad to hear it. A man should always have an occupation of some kind.’ — Oscar Wilde
the occupancy of land
tenure
the act of taking possession or the holding and control of a place or area, esp by a foreign military force
the period of time for which a place or area is occupied
[Middle English occupacioun via French from Latin occupation-, occupatio, from occupare: see occupy]