Definition of theoretical
1
: existing only in theory : hypothetical
gave as an example a theoretical situation
2a
: relating to or having the character of theory : abstract
b
: confined to theory or speculation often in contrast to practical applications : speculative
theoretical physics
3
: given to or skilled in theorizing
a brilliant theoretical physicist
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Merriam-Webster unabridged
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Time Traveler for theoretical
The first known use of theoretical was in 1601
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