N.B. Meaning: Definition, Uses & Examples

🕓 Last updated on July 17, 2026

If you’ve ever spotted N.B. at the start of a sentence in a book, a contract, or an email and paused to wonder what it means, you’re in good company. 

It’s one of those small abbreviations that shows up constantly in formal writing, yet almost nobody explains it.

So what does N.B. mean? N.B. stands for the Latin phrase nota bene, which translates to note well. 

Writers use it to flag information the reader shouldn’t skip past  an exception, a warning, or a detail that changes how the rest of the text should be read.

You’ll also see it written without periods, as NB, and in certain contexts (like gender identity) it can mean something entirely different. 

In this guide, we’ll break down the full n.b. meaning, how to use it correctly, and how it compares to similar abbreviations like P.S. and i.e.

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How Is N.B. Used?

N.B. is used to draw attention to information that could easily be missed if it were buried in regular text. Writers reach for it when they want to flag an exception, a clarification, a caveat, or a detail that directly affects how the reader should act on what they just read.

It commonly appears in:

• Contracts and legal documents  highlighting a condition or deadlineCopy
• Academic papers  clarifying a methodology or citation detailCopy
• Business emails  flagging a change to previously shared informationCopy
• Instructions or manuals  warning about a step that’s easy to overlookCopy

For example:

Submissions close at 5 PM Friday. N.B.: late entries will not be reviewed, regardless of circumstance.

Here, the N.B. isn’t repeating the deadline  it’s adding a consequence the reader needs to know before they decide anything. That’s the core function of N.B.: not restating, but reinforcing why something matters.

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N.B. vs. Similar Abbreviations

N.B. often gets confused with other Latin-derived abbreviations, but each serves a different purpose. Knowing the distinction helps you use them correctly  and avoid awkward mix-ups in formal writing.

Abbreviation	Latin Origin	Meaning	Typical Use
N.B.	nota bene	Note well	Flags important information within the text
P.S.	post scriptum	After what has been written	Adds an afterthought, usually at the end
E.g.	exempli gratia	For example	Introduces an example
I.e.	id est	That is	Clarifies or restates more precisely
Cf.	confer	Compare	Points to another source

The easiest way to remember the difference: P.S. adds something new after the fact, while N.B. emphasizes something already relevant to the point being made. E.g. and i.e. clarify meaning, but neither carries N.B.’s sense of urgency or warning.

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Where You’ll See It

N.B. shows up most often in formal, precise writing where a missed detail could have real consequences. Common places include:

• Legal documents and contracts  flagging conditions, deadlines, or liability clauses that affect the agreementCopy
• Academic papers and footnotes  clarifying methodology, data limitations, or citation detailsCopy
• Formal letters and memos  adding a note that changes how the reader should interpret the main messageCopy
• Reference books and manuals  warning about exceptions to a general rule or instructionCopy
• Business correspondence  highlighting updates to terms, pricing, or schedulingCopy

It’s far less common in casual writing or everyday conversation. Text messages, social captions, and blog posts tend to favor plain English  note, important, or heads up  over a Latin abbreviation that not everyone recognizes. That said, N.B. still turns up in emails and workplace documents when the writer wants a concise, formal way to flag something without breaking the tone of the rest of the message.

Should You Use N.B. in Your Own Writing?

Whether N.B. belongs in your writing depends on context. In formal or technical documents  contracts, academic papers, legal notices  it’s a concise, established way to flag important information without disrupting the tone. Readers in these fields generally recognize it immediately, so it saves space without sacrificing clarity.

In everyday writing, though, N.B. can feel a little dated or overly formal. Blog posts, casual emails, and social content usually read better with plain English alternatives like Note:, Important:, or Heads up:  phrases that convey the same urgency without sending readers to a dictionary.

A good rule of thumb: match N.B. to the formality of the document. If the rest of your writing already leans academic, legal, or professional, N.B. fits naturally. If you’re writing for a general or casual audience, spelling it out keeps things accessible without losing any of the emphasis you’re going for.

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Quick Recap

N.B. is a small abbreviation with a specific job: making sure readers don’t skim past something important. Here’s the essential takeaway:

• N.B. stands for nota bene, Latin for note wellCopy
• It’s used to flag exceptions, warnings, or details that affect how the reader should actCopy
• You’ll find it most often in legal documents, academic writing, contracts, and formal correspondenceCopy
• It differs from P.S., which adds an afterthought, and from e.g./i.e., which clarify meaning rather than emphasize itCopy
• In casual writing, plain alternatives like Note: or Important: usually communicate the same idea more naturallyCopy

Whether or not you use N.B. in your own writing comes down to tone. In formal contexts, it’s a precise, professional shorthand. Everywhere else, spelling it out tends to serve readers better. Either way, the next time you spot N.B. in a document, you’ll know exactly why it’s there  and exactly what it’s asking you to pay attention to.

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Other Meanings of NB

Because NB is short and versatile, it doesn’t always mean nota bene. Context changes everything:

• Non-binary  In conversations about gender identity, NB (or enby) is commonly used as shorthand for someone who identifies outside the male/female binary. This usage has become especially common on social media and in bios.Copy
• New Brunswick  The Canadian province uses NB as its official postal abbreviation.Copy
• Texting and casual chat  Occasionally used loosely to mean note or by the way, though this is less standardized than its Latin origin.Copy
• Niobium  In chemistry, Nb (capital N, lowercase b) is the periodic table symbol for the element niobium.Copy

If you see NB and the meaning isn’t obvious, check the surrounding context  a legal document almost always means nota bene, while a social media bio likely means non-binary.

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FAQs

What does N.B. stand for?
N.B. stands for nota bene, a Latin phrase meaning note well. It’s used to draw attention to important information.

Is N.B. the same as NB?
Yes. N.B., NB, and nb are all accepted variations of the same abbreviation, with or without periods.

How do you use N.B. in a sentence?
Place it at the start of a note or sentence, usually followed by a colon: N.B.: Payment is due within 30 days.

Is N.B. the same as P.S.?
No. P.S. adds an afterthought at the end of a letter, while N.B. emphasizes something already relevant within the text.

Does NB always mean nota bene?
Not always. In gender identity contexts, NB commonly means non-binary. Context determines the correct meaning.

Is N.B. still used today?
Yes, though mainly in formal, legal, and academic writing rather than everyday conversation.

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Conclusion

N.B. may be small, but it carries real weight in formal writing. Rooted in the Latin phrase nota bene, it exists for one purpose: making sure readers don’t miss something important.

You’re drafting a contract, an academic paper, or a formal email, knowing when and how to use N.B. adds precision to your writing. And now that you know its meaning  and how it differs from P.S., e.g., and i.e.  you’ll never second-guess it again.

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