Enlargement may refer to:the growth in membership of political entities: Enlargement of the European Union is the political process for integrating countries into the European Union. Enlargement of the African Union Enlargement of the Arab League Enlargement of the United Nations Enlargement of NATO Enlargement of Switzerland Enlargement of the European Space Agency in other contexts: In mathematics, an enlargement is a uniform scaling, an example of a Homothetic transformation that increases distances, areas and volumes. Enlargement is a theme in fiction, especially in science fiction and fantasy. An enlargement is a photographic print that is larger than the negative it is printed from, through the use of an enlarger. Penis enlargement.