C1adjectiveformal3K

Theoretical

UK /["/ˌθɪəˈretɪkl/"]/US /["/ˌθiːəˈretɪkl/"]/

Definition

connected with the ideas and principles on which a particular subject is based, rather than with practice and experiment

In simple words: Related to ideas or theories, not practical or based on real experience.

Examples

  • a theoretical approach
  • theoretical physics
  • The first year provides students with a sound theoretical basis for later study.
  • Early analyses of evolution on the planet were highly theoretical.
  • Most experiments take place within a theoretical framework.
  • Theoretical knowledge forms the basis of most of our teaching.
  • This study is by no means purely theoretical.
  • We aim to provide you with both theoretical and practical knowledge of your subject.
  • It's a theoretical possibility.

Usage notes

Used in academic or scientific contexts to discuss concepts that are not based on practical application. Avoid in casual conversations.

Grammar pattern

standalone adjective

Memory hint

Think of theories being like a 'guess' — theoretical ideas are thoughts, not actions.

Collocations

  • be
  • remain
  • highly
  • merely
  • purely
  • be
  • remain
  • highly
  • merely
  • purely

Synonyms

  • abstract
  • hypothetical
  • conceptual
  • ideal
  • academic

Antonyms

  • practical
  • realistic
  • actual

Common mistakes

  • Confused with 'theoretical' vs 'practical'.
  • Using 'theoretical' to describe something concrete or tangible.
  • Incorrectly using it as a noun.