Noun
interpositive (plural interpositives)
A specialized type of negative film stock that is part of the intermediate process that goes from an original negative to a release element (most common in the motion picture film post-production process). The material used is itself the same as in an internegative. The differences is that an IP has a positive image on it, while an IN has a negative image.
Interpositive (IP) prints are struck from the OCN, checked to make sure they look the same as the custom timed Answer Print, and then each IP is used to make one or more Dupe Negative (DN) copies. Source: Internet