therefore
Americanadverb
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thus; hence: used to mark an inference on the speaker's part
those people have their umbrellas up: therefore, it must be raining
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consequently; as a result
they heard the warning on the radio and therefore took another route
Synonym Usage
Therefore, wherefore, accordingly, consequently, so, then all introduce a statement resulting from, or caused by, what immediately precedes. Therefore (for this or that reason) and wherefore (for which reason) imply exactness of reasoning; they are especially used in logic, law, mathematics, etc., and in a formal style of speaking or writing. Accordingly (in conformity with the preceding) and consequently (as a result, or sequence, or effect of the preceding), although also somewhat formal, occur mainly in less technical contexts. So (because the preceding is true or this being the case) and then (since the preceding is true) are informal or conversational in tone.
Etymology
Origin of therefore
First recorded in 1125–75; Middle English ther(e)fore, variant of therfor therefor
Compare meaning
How does therefore compare to similar and commonly confused words? Explore the most common comparisons:
Explanation
The adverb therefore means as a result or consequence, or "for that reason." Cats and dogs tend to fight; therefore, keep your pets apart at night if you want to get some sleep. The adverb therefore is also used to introduce a conclusion that follows based on logic. You'll see this construction a lot in logic, math, and science, for example. Of course, sometimes the conclusions are false, as in this argument: "All fish live in water. A whale lives in water. Therefore, a whale is a fish." A whale is, in fact, a mammal. Therefore, the argument that a whale is a fish is wrong.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Being able to control where these vortices travel could therefore help scientists improve superconducting devices.
From Science Daily ● Oct. 16, 2026
She is therefore one of the century’s most infamous liars.
From The Wall Street Journal ● Oct. 15, 2026
While profit margins are commercially sensitive and therefore not generally revealed, industry studies show that the toy firm and retailer would usually make a profit of up to 25% or $2.50.
From BBC ● Oct. 14, 2026
He had been expecting enterprise adoption of AI to drive demand for more hardware to support the technology, and to therefore lead to higher revenues.
From MarketWatch ● Oct. 14, 2026
“Well, Pip, you know,” replied Joe, as if that were a little unreasonable, “you yourself see me put ’em in my ’at, and therefore you know as they are here.”
From "Great Expectations" by Charles Dickens
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
