Origin: Latin suffix -al
Theoretical has 3 different meanings across 1 category:
concerned primarily with theories or hypotheses rather than practical considerations
"theoretical science"
Of or relating to theory; abstract; not empirical.
"The professor explained that while their current model is purely theoretical, it cannot be tested until they build a physical prototype."
In plain English: Theoretical means something exists only as an idea or plan rather than being proven by real-world experience.
"The professor explained that his theoretical knowledge would not be enough to fix the broken machine without practical experience."
Usage: Use this adjective when describing ideas, models, or principles that exist in concept but have not yet been tested through observation or experiment. It often contrasts with words like "practical," which refers to methods used in real-world situations rather than just thought experiments.
The word theoretical comes from the Latin theōrēticus, which itself was borrowed from Ancient Greek. It entered English through Middle English with a meaning related to theory or speculation.