Unfortunately, despite everything above, the intro is now inaccurate and asserts only one POV that is inconsistent with other citable information.  If at all, this should coexist with other definitions, if applicable, and not prevail (e.g., no mention of continent at all in intro).  For example, two dictionaries – Oxford and Webster's – both list and reckon seven continents: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.  Feel free to verify this.  Of course, other definitions are based on culture, geology, seismology, ecology, et al.  To that end, I will be making editions that dually embrace this ambiguity (e.g., notations of continent), not just the concept stated therein.