thereof

[thair-uhv, -ov]

adverb

1. of that or it.

2. from or out of that origin or cause.

thereof

/ ˌðɛərˈɒv /

adverb

1. of or concerning that or it

2. from or because of that

Word History and Origins

Origin of thereof¹

before 1000; Middle English therof, Old English thǣrof. See there, of ¹

Example Sentences

“Now he’s standing on deck, cursing the wind or lack thereof, and praying for a breeze. Looks like his prayers are soon answered, for a storm kicks up and blows them hither and yon.”

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Perhaps some artificial aristocrats happen to qualify as natural ones, but for the sake of the American experiment, they must not merit any presumption thereof.

Read more on The Wall Street Journal

These products are now exempted from his "reciprocal" tariffs, imposed this year to address behavior deemed unfair, after the administration considered issues like the US capacity -- or lack thereof -- to produce certain goods.

Read more on Barron's

Then you need something for the after-death period, whether it’s a will or trust or some combination thereof, and beneficiary designations on financial accounts.

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But in both of the Trojans’ losses, the pass rush — or lack thereof — was part of the problem.

Read more on Los Angeles Times

When To Use

What does thereof mean?

Thereof means of, from, because of, or concerning the thing that was just mentioned, as in The warranty covers the device and the parts thereof (translation: The warranty covers the device and the parts of the device).Thereof is fairly formal. It’s often used in legal language, but it can also be used in everyday speech and writing.Thereof is perhaps most commonly used in the phrase lack thereof, meaning the lack of the thing just mentioned. This is used in cases in which something is mentioned in a general way but the situation being discussed involves the lack of that thing, as in Most relationship problems are due to communication, or a lack thereof (translation: Most relationship problems are due to communication issues, specifically a lack of communication).Other common phrases that use the word are combination thereof (meaning a combination of the things just mentioned) and portion thereof (meaning a portion of the things just mentioned).Example: My research is focused on investigating the cause of the disease and the effects thereof.