Two-dimensional is a term used to describe objects that have two dimensions, such as length and width. This term can be broken down into four crossword solutions: planar (6 letters), PLANE (5 letters), LINEAR (6 letters), and scalar (6 letters). Planar refers to a flat surface, while PLANE is a two-dimensional surface that extends infinitely in all directions. LINEAR describes something that has one dimension, such as a line, while scalar is a quantity that has magnitude but no direction.