Alfred Webre first came up with the word 'exopolitics' and he defined it as the study of political process and governance in interstellar society.
Michael Salla defines exopolitcs as the study of the political implications of the extraterrestrial presence on Earth, and more specifically as the study of the key individuals, institutions and political processes associated with extraterrestrial life.
Wikipedia describes exopolitics as a speculative branch of political science, which studies of possible contact and relations between humanity and extraterrestrial civilizations.
Based on these definitions, we can define exopolitcs as a new scientific discipline that focuses on the political aspects of interactions with extraterrestrial life. It studies the key individuals, institutions and political processes that are associated with extraterrestrial life in general, as well as, more specifically, those associated with the extraterrestrial presence here on Earth.