(TANTAI) The objective of the Instrumentality Project was the artificial evolution of humankind into a "perfect single being". This single being means a life form which ends as a single individual (encompassing everyone, i.e. a lack of personal individuality), and is used to differentiate from "colony" - a life form comprised of multiple individuals.

Source: The End of Evangelion : Glossary contained within The End of Evangelion - Theatrical Program.