The definition of widespread is something well-known or given out over a large area or to a large group of people.
When everyone believes that a myth is true, this is an example of a widespread myth.
spread widely; esp.,
- widely extended: widespread arms
- distributed, circulated, or occurring over a wide area or extent: widespread benefits, widespread rumors
- Spread or scattered over a considerable extent: widespread fallout from a nuclear explosion.
- Occurring or accepted widely: a widespread misunderstanding.
(comparative more widespread or widerspread, superlative most widespread or widestspread)