| Noun | 1. | disappearance - the act of leaving secretly or without explanationappearance - the act of appearing in public view; "the rookie made a brief appearance in the first period"; "it was Bernhardt's last appearance in America" | |
| 2. | disappearance - the event of passing out of sightingress, immersion - (astronomy) the disappearance of a celestial body prior to an eclipse evanescence - the event of fading and gradually vanishing from sight; "the evanescence of the morning mist" vanishing - a sudden or mysterious disappearance | |
| 3. | disappearance - gradually ceasing to be visible | |