Definition of actualism in US English:



  • 1Philosophy. The doctrine that only what is actual exists, and hence entities which are only possible do not exist; belief in the importance of the actual.

  • 2Realism in description or representation; = "actuality".

  • 3Geology. The theory or principle that changes in the geological past can be explained in terms of processes observable in the present. Compare actualist. Now chiefly historical.


Mid 19th century; earliest use found in Brownson's Quarterly Review. From actual + -ism.