(not comparable) Existing in three dimensions / (comparable) Having depth, or the illusion of depth, as well as height and width. / (comparable) Lifelike.

Existing in two dimensions. / Not creating the illusion of depth; lacking detail or believability.

(mathematics) Having an arbitrary number of dimensions.

(algebraic geometry) Having four dimensions; being measurable along four mutually perpendicular axes.

(mathematics) (of a vector space) having a basis consisting of a finite number of elements.

(geometry) Having zero dimensions; having no extent in any direction.

(mathematics, physics) The study of the dimensions of physical quantities; used to obtain information about large complex systems, and as a means of checking mathematical and physics equations.

Having length, but no width, height or depth. / (figuratively) Lacking depth or believability; flat. / (figuratively) Lacking personal depth and substance; conceited, vain, shallow, superficial.

Possessing eleven geometric dimensions.

(US) Lumber that is finished/planed and cut to standardized width and depth specified in inches.