A consolidation high school (or a "united" high school) are schools that draw from a number of districts. For example, there was a united high school in a town near mine... the students came up from various elementary schools in different towns. So rather than having 10 high schools with only 30 kids at each, you have a bigger high school (in a centralized location, often up to a 30-45 minute drive) of 300 kids.