imaginary
/i-ˈma-jə-ˌner-ē/
adjective
existing only in imagination : lacking factual reality
formed or characterized imaginatively or arbitrarily
containing or relating to the imaginary unit
his canvases, chiefly imaginary, somber landscapes
noun
a complex number (such as 2 + 3i) in which the coefficient of the imaginary unit is not zero —called also imaginary
noun
the part of a complex number (such as 3i in 2 + 3i) that has the imaginary unit as a factor