(US) A generic citizen.

A member of a loose movement of Americans, Canadians and Australians who consider themselves answerable only to their own particular interpretation of the common law, and not subject to any government statutes or proceedings.

Of or relating to citizen science; collected as a part of a citizen science project.

Of or relating to citizen science. / (Of data) collected for citizen science.

A person who takes the view that they belong to no particular country or state, especially such a person who travels widely to different countries. / A person acting as part of the global citizenry.

A citizen of one's country or city.

(idiomatic) Synonym of John Doe

(uncountable, law) The right of a person who is not acting as a sworn law enforcement official to detain a suspected criminal until the police can be summoned.

A person who has done much good for his or her society.

(media) An amateur journalist who engages in citizen journalism.