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Close Encounter a supposed encounter with a UFO, and divided into categories, from a Close Encounter of the First Kind (sighting but no physical evidence), through Second (physical evidence left) and Third (extra-terrestrials beings observed) to a Close Encounter of the Fourth Kind, which involves abduction by aliens. The expression was popularized by the science-fiction film Close Encounters of the Third Kind (1977).

close season a period between specified dates when fishing or the killing of particular game is officially forbidden.

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