thereof

American  

[thair-uhv, -ov] / ˌðɛərˈʌv, -ˈɒv /

adverb

1. of that or it.

2. from or out of that origin or cause.

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thereof British  

/ ˌðɛərˈɒv /

adverb

1. of or concerning that or it

2. from or because of that

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Usage

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.

Etymology

Origin of thereof

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

Example Sentences

Your challenges are twofold: diversification or lack thereof and controlling your withdrawals, hopefully with an aggressive Roth conversion plan that also leaves tax-free withdrawals for your children as part of their inheritance.

From MarketWatch

Or, put another way, it’s about folks’ lived experience, their economic security, or lack thereof, and personal well-being.

From Los Angeles Times

The rules—or lack thereof—around these blacklists don’t serve justice but pervert it.

From The Wall Street Journal

The key phrase “subject to the jurisdiction thereof” has been understood to mean “subject to the laws” of the United States,” and that includes nearly everyone here except foreign diplomats.

From Los Angeles Times

The language of the amendment states: "All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States."

From BBC