In Witness Whereof vs. In Witness Thereof – Which is Correct?

The correct standard legal phrase is “in witness whereof,” meaning “in testimony of which” or “by signing this document.” “Thereof” is a valid word meaning “of that,” but “in witness thereof” is uncommon and usually awkward in this formula. Use “whereof” in contracts, deeds, and certificates in another construction.

In Witness Whereof or Thereof – Which is Correct?

“In witness whereof” is the established and preferred phrase in legal documents. It introduces a concluding statement showing that the parties have signed or executed an instrument as evidence of the matters described in it.

“Thereof” is not a misspelling. It is a valid formal adverb meaning “of that” or “of the thing just mentioned.” However, it does not normally replace whereof in the fixed expression in witness whereof. The phrase in witness thereof may be grammatically interpretable in some contexts, but it is uncommon, less idiomatic, and generally not the preferred legal wording.

The Best Trick to Remember the Difference

Use the replacement test: replace whereof with “of which”. “In witness of which” makes sense because the phrase refers back to the document, agreement, or facts being witnessed. Replace thereof with “of that”. Although “in witness of that” can be understood, it does not produce the conventional legal formula.

Word	Part of Speech	Meaning	Example
whereof	Relative adverb	Of which; of what	In witness whereof, the parties have signed below.
thereof	Demonstrative adverb	Of that; of the thing mentioned	The tenant accepted the terms thereof.

How to Use In Witness Whereof

In witness whereof is a fixed, highly formal phrase traditionally used near the end of contracts, deeds, affidavits, certificates, and other legal instruments. It means “as evidence of the matters stated above” or “in testimony of which.” The phrase is usually followed by a statement that the parties signed, sealed, or executed the document.

Modern legal writers sometimes avoid the phrase because it is archaic and unnecessarily ceremonial. A clearer alternative is often “By signing below” or “The parties have executed this agreement as of the date written above.” When a traditional closing clause is appropriate, however, in witness whereof remains correct.

Example 1: In witness whereof, the parties have executed this agreement as of the date first written above.

Example 2: In witness whereof, the undersigned hereby affixes his or her signature and seal.

Example 3: In witness whereof, the parties have signed this deed in the presence of the witnesses identified below.

Etymology of the word Whereof

Whereof combines where with of. In older English, where could refer not only to a place but also to a matter or circumstance. As a result, whereof developed the meaning “of which” or “of what.” It belongs to a group of traditional compounds such as wherein, whereby, and whereas.

How to Use Thereof

Thereof is a formal adverb meaning “of that,” “of the thing mentioned,” or “of the document or matter just discussed.” It commonly appears in contracts, statutes, regulations, official reports, and other formal writing. It usually refers backward to a clearly identified noun or idea.

Although thereof is grammatically correct, it can make a sentence sound stiff or difficult to read. In ordinary modern English, phrases such as “of it,” “of that,” or “of the agreement” are often clearer.

Example 1: The purchaser shall pay the full price stated in the agreement and any taxes arising thereof.

Example 2: The board approved the policy and each provision thereof.

Example 3: The contractor must keep a copy of the permit and comply with all conditions thereof.

What are the different forms of Thereof?

Thereof is an invariable adverb. It does not have plural forms, verb tenses, or comparative and superlative forms. Related formal compounds include therein (“in that”), thereunder (“under that”), thereby (“by that”), and thereto (“to that”).

Etymology of the word Thereof

Thereof comes from the combination of there and of. In earlier forms of English, there could refer to a previously mentioned matter rather than only to a physical location. The compound therefore developed the meaning “of that” or “of the matter referred to.”

Related Concepts

Understanding formal relative adverbs and legal drafting conventions makes the difference between whereof and thereof easier to recognize.

• Relative adverbs: Words such as whereof, wherein, and whereby connect a statement to something previously mentioned. They often correspond to phrases such as “of which,” “in which,” and “by which.”
• Demonstrative adverbs: Words such as thereof, therein, and thereunder point back to a specific matter, document, or provision.
• Legal archaisms: Traditional legal phrases often preserve older vocabulary and sentence structures. They may be correct but less direct than modern plain-English alternatives.
• Anaphoric reference: Both words typically refer backward to information already stated. The surrounding text must make the intended reference clear.

Examples from Media and Literature

Formal legal language appears frequently in stories involving contracts, inheritances, government proceedings, and courtroom disputes. The following examples show how the preferred phrase or the related word may appear in realistic contexts:

• Legal dramas: A fictional attorney may read a deed ending with “In witness whereof,” followed by the signatures of the grantor and witnesses.
• Historical novels: A royal charter or land grant may use “in witness whereof” to create an old-fashioned ceremonial tone.
• Business fiction: Characters negotiating a merger may refer to “the obligations thereof,” meaning the obligations of the agreement just discussed.
• Government reports: An official certificate may use “in witness whereof” before identifying the officer who signed and sealed it.
• Courtroom scenes: A judge or lawyer may explain that “thereof” refers to a previously mentioned order, claim, or legal provision.

Practice Exercises

Choose the correct word to complete each sentence.

1. In witness ______, the parties signed three identical copies of the agreement.
2. The company shall comply with every condition ______ stated in the permit.
3. In witness ______, the notary placed an official seal on the document.
4. The buyer accepted the terms ______ before making payment.
5. Which word means “of which” in the traditional closing phrase: whereof or thereof?

Answer Key

1. whereof
2. thereof
3. whereof
4. thereof
5. whereof

Whereof Synonyms

Synonym	Definition
of which	The clearest modern equivalent of whereof.
of what	Refers to the subject or matter being discussed.
about which	Used when whereof refers to a topic or matter.
in testimony of which	A modern explanatory equivalent for the legal phrase in witness whereof.

Thereof Synonyms

Synonym	Definition
of that	The direct modern equivalent of thereof.
of it	A less formal substitute when the reference is clear.
of the matter	Clarifies that the word refers to a previously discussed subject.
of the document	A precise alternative when thereof refers to a particular document.

Frequently Asked Questions

Question 1: Is “in witness whereof” grammatically correct?
Yes. It is a traditional formal phrase meaning “in testimony of which.” It is especially common in the concluding section of legal documents.

Question 2: Is “in witness thereof” wrong?
It is not necessarily impossible to interpret, because thereof is a valid word. However, it is uncommon and not the standard form of the established phrase. In most contracts and deeds, use in witness whereof.

Question 3: What does “in witness whereof” mean in a contract?
It means that the parties are signing the contract as evidence of their agreement and of the statements or obligations contained in it.

Question 4: Can plain English replace “in witness whereof”?
Yes. Depending on the document, clearer alternatives include “By signing below,” “The parties have signed this agreement,” or “The parties execute this agreement as of the date above.”

Conclusion

Use “in witness whereof” as the conventional legal closing phrase. Use thereof separately when you mean “of that” or “of the matter just mentioned.” Although both words are valid, confusing them in a formal document can make the writing appear careless. Pro Tip: In contracts and professional correspondence, choose the established phrase or a clear plain-English alternative to protect your credibility.