Meaning of IMAGINARY in English

IMAGINARY

adj. 1 existing only in the imagination. 2 Math. being the square root of a negative quantity, and plotted graphically in a direction usu. perpendicular to the axis of real quantities (see REAL(1)). imaginarily adv.

[ ME f. L imaginarius (as IMAGE) ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.