Designating or relating to objects apprehended not by sense perception but by thought or abstraction (abstraction, n. 3); (more generally) †unreal…

Existing in thought or as an idea but not having a physical or concrete existence; conceptual. Frequently opposed to concrete.

= abstract, adj. 1.

Not concrete; abstract; immaterial.

Philosophy. Not accessible to investigation by the senses; inapprehensible.

Not embodied, in various senses.

Of or relating to abstraction, esp. to the consideration of things in the abstract.

Conceptual rather than material; abstract. Opposed to concrete. Now rare.