Определение venn diagram в Английский Язык Английский Язык словарь
A diagram representing sets by circles or ellipses (and sometimes also the universal set as a rectangle enclosing all of these shapes) and indicating the relationships between the sets:
A diagram using circles to represent sets, with the position and overlap of the circles indicating the relationships between the sets. a picture showing the relationship between several things by using circles that partly cover each other (John Venn (1834-1923), British logician)
a diagram that uses circles to represent set theory; the position and overlap of the circles indicate the relations among the sets