You use theoretically to say that although something is supposed to be true or to happen in the way stated, it may not in fact be true or happen in that way.
Theoretically, the price is supposed to be marked on the shelf.
Emigration was still theoretically a matter of choice.
Examples of 'theoretically' in a sentence
theoretically
Electricity is still theoretically the best way to power a vehicle.
Times, Sunday Times (2010)
Yet there is also much to relish in a work that is both theoretically informed and rigorously grounded in primary research.
The Times Literary Supplement (2012)
His death will almost certainly bring an end to the planned trial of the facts, although theoretically it could still go ahead.
Times, Sunday Times (2015)
Theoretically, declarer still had no chance of succeeding, but watch.
Times, Sunday Times (2011)
Likewise shareholders may theoretically qualify for dividends, but these aren't normally paid because profits are reinvested.
Times, Sunday Times (2016)
That said, it is still theoretically possible for a woman to get pregnant right up until her last period - as an increasing number are discovering.
Times, Sunday Times (2010)
In other languages
theoretically
British English: theoretically ADVERB
You use theoretically to say that although something is supposed to be true or to happen in a certain way, it may not in fact be true or happen in that way.
Theoretically, the price is supposed to be marked on the shelf.