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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.

The first records of the word thereof come from before 1000.

There are many similar words based on the combination of the word there and a preposition, each of which has a different meaning, including thereabout, thereabouts, thereafter, thereat, thereby, therefor, therefore, therefrom, therein, thereinafter, thereinto, thereon, thereto, theretofore, thereunder, thereupon, therewith, and therewithal.

Other words are constructed in similar ways, such as whereof, meaning “of what, which, or whom,” as in The person whereof I speak (translation: the person of whom I speak or The person I’m speaking about).

What are some synonyms for thereof?

• thence
• therefrom

What are some words that share a root or word element with thereof?��

• thereabout
• thereabouts
• thereafter
• thereat
• thereby
• therefor
• therefore
• therein
• thereinafter
• thereinto
• thereon
• thereto
• theretofore
• thereunder
• thereupon
• therewith
• therewithal
• whereof

What are some words that often get used in discussing thereof?

• lack
• combination
• portion
• use

Thereof is fairly formal and is often used in legal language. But it’s not uncommon for it to be used in everyday speech, especially in phrases like a lack thereof or a combination thereof.

18 U.S. Code § 2383: "Whoever incites, sets on foot, assists, or engages in any rebellion or insurrection against the authority of the United States or the laws thereof, or gives aid or comfort thereto, shall be…imprisoned not more than ten years" 🔥⚖️

— Eric Garland (@ericgarland)

The men from the 2020 season of join the women of in releasing a joint statement: “We stand united in denouncing any racist behavior and any defense thereof”

— The Hollywood Reporter (@THR)

To our Australian listeners, who do you recommend we interview on climate policy in Australia, or lack thereof? ?

— Andrea Chalupa 🇺🇲 (@AndreaChalupa)

If you don't believe systemic racism is real and prevalent after watching a bunch of white domestic terrorists storm the Capitol to take selfies and steal a podium with no police intervention, you're either stupid, willfully ignorant, full-on racist, or some combination thereof.

— Max Scoville (@MaxScoville)

Is thereof used correctly in the following sentence?

I need to talk to you about your punctuality, or lack thereof.