Fundamental
Fundamental adjective - Of or relating to the simplest facts or theories of a subject.
Theoretical and fundamental are semantically related. in basic topic. In some cases you can use "Theoretical" instead an adjective "Fundamental".
Theoretical
Theoretical adjective - Existing only as an assumption or speculation.
Fundamental and theoretical are semantically related. Sometimes you can use "Fundamental" instead an adjective "Theoretical".
Both words in one sentence
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Theoretical physicists frequently write their equations in terms of Planck units, units derived by setting each of 5 fundamental constants of the universe equal to 1.
Source: Hiroshima as a Unit of Measure
Cite this Source
Theoretical and Fundamental. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/fundamental/theoretical
Fundamental & Theoretical. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/fundamental/theoretical>.
Theoretical or Fundamental. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/fundamental/theoretical.
Google Ngram Viewer shows how "fundamental" and "theoretical" have occurred on timeline