Possessing
width and
height, but not
depth (the
third spatial dimension). "
Flat". Often used as part of the phrase "two-dimensional
surface", such as a flat
painting, tabletop, wall, or floor.
In a literary context, a two-dimensional character is one who possesses ambitions and motives, but no clear past or reasons to explain them. Most TV or comic book characters begin as two-dimensional characters until they've existed long enough to have their past and origins explored by the writers.