miss·ing / ˈmising/ • adj. (of a thing) not able to be found because it is not in its expected place: a quantity of cash has gone missing. ∎ not present or included when expected or supposed to be: passion was an element that had been missing from her life for too long | you can fill in the missing details later. ∎ (of a person) absent from a place, esp. home, and of unknown whereabouts: she alerted police that her son was missing. ∎ (of a person) not yet traced or confirmed as alive, but not known to be dead, after an accident or during wartime: servicemen listed as missing in action.