The term "ordinary citizen" refers to an individual who is not a member of any particular profession or group, but rather someone who simply lives in and is part of society. This person may have a job, raise a family, pay taxes, vote, and participate in community activities just like anyone else. The phrase often implies that this person does not hold any special power or influence beyond what an average member of the public would possess. In other words, they are simply citizens who live their lives without holding positions of authority or fame.