The correct modern form is goodbye, written as one word.
The form good bye may appear in older material or historical examples, but it is not the normal spelling to choose in contemporary American English. Modern dictionaries treat goodbye as the established form, while documented variants reflect earlier spelling practices.
This makes the choice fairly simple for everyday writing: use goodbye when you are saying farewell or referring to a farewell.
Quick Answer
Goodbye is the standard choice in modern US English.
Use:
- Goodbye! when saying farewell.
- She said goodbye before leaving.
- We exchanged goodbyes at the airport.
The two-word form good bye can be found in older writing, but it should not normally replace the established one-word form in current American prose.
The important point is that the forms do not normally express different meanings. The difference is mainly their status in written usage.
Why People Confuse Them
The confusion is understandable because goodbye visibly contains the familiar words good and bye. A reader may naturally wonder whether they should remain separate.
Historical English adds another layer of confusion. The farewell expression has appeared in several written forms over time. Dictionaries still preserve some of those variants, which means readers can encounter them in older books, quotations, or historical material.
That does not mean all recorded forms are equally suitable for modern writing. A dictionary can document an older form without making it the preferred choice today.
Key Differences At A Glance
| Context | Best Choice | Why |
|---|---|---|
| Everyday conversation written down | goodbye | Standard modern form |
| Text messages | goodbye | Natural and familiar |
| Professional writing | goodbye | Clear and conventional |
| Academic writing | goodbye | Standard current spelling |
| Historical quotation | good bye may appear | Preserve the original wording when appropriate |
| General modern prose | goodbye | The established current form |
A useful rule is simple: write goodbye as one word unless you are deliberately reproducing an older form.
| Feature | Goodbye | Good bye |
|---|---|---|
| Modern standard status | Established | Historical or nonstandard in current prose |
| Basic meaning | Farewell | Same intended farewell meaning when encountered |
| Current general writing | Preferred | Usually avoid |
| Noun use | Yes | Not normally treated as a separate modern noun form |
| Interjection use | Yes | Historical/variant usage |
Meaning and Usage Difference
There is no important modern meaning difference between goodbye and good bye when the latter appears as a spelling variant.
Goodbye can be used when someone leaves, when you leave someone else, or when describing the act or words of parting. Cambridge and Oxford both record its use as an exclamation and as a noun.
For example:
- Goodbye, everyone.
- I forgot to say goodbye.
- Their goodbye was brief.
The spaced form does not normally introduce a different action, emotion, or level of politeness. Its main issue is that it does not match the standard modern written form.
Tone, Context, and Formality
Goodbye is flexible. It can sound warm, neutral, serious, or emotional depending on the situation.
You can use it with friends:
“Goodbye! Text me when you get home.”
You can also use it in a workplace setting:
“Thanks for your help. Goodbye, everyone.”
It can even appear in formal or serious prose when the context calls for a farewell.
The form good bye does not normally create a special formal tone. Instead, its spacing may make the writing look old-fashioned or unusual. If you are writing contemporary American English, there is usually no practical reason to choose it.
Which One Should You Use?
Choose goodbye in almost all modern writing.
Use goodbye in:
- Text messages
- Emails
- School assignments
- Workplace communication
- Articles and reports
- Books and general prose
- Captions and everyday writing
The main exception is when you are reproducing historical wording exactly. In that situation, preserving an older spelling can be appropriate because the goal is to represent the original material rather than modernize it.
For ordinary writing, however, there is no need to hesitate: goodbye is the natural choice.
When One Choice Sounds Wrong
Good bye can look wrong or at least noticeably unusual in contemporary American prose because readers generally expect the established one-word spelling.
Compare:
- She said goodbye and walked away. ✓
- She said good bye and walked away. — unusual in current standard writing
The second sentence is understandable, and historical sources can contain the spaced form. The issue is not that readers cannot understand it. The issue is that it does not reflect the normal modern spelling.
That distinction matters. A documented historical form and a preferred current form are not necessarily the same thing.
Common Mistakes (and Quick Fixes)
Mistake: Writing the word as two separate words in ordinary modern prose.
Fix: Write goodbye.
Mistake: Assuming the meaning changes because the spacing changes.
Fix: The intended farewell meaning remains the same; the important difference is written form and current usage.
Mistake: Treating goodbye as only an interjection.
Fix: It can also function as a noun: “We exchanged goodbyes.”
Mistake: Adding an apostrophe to the plural.
Fix: The plural is goodbyes, not “goodbye’s.”
Mistake: Assuming an older spelling must be wrong because it appears in a book.
Fix: Historical writing can preserve forms that are no longer the normal modern choice.
Everyday Examples
Here are natural examples for modern US English:
- Goodbye! Have a safe trip.
- She said goodbye to her coworkers before leaving.
- We waved goodbye as the bus pulled away.
- He forgot to say goodbye before heading home.
- Their goodbye at the airport was emotional.
- The children said their goodbyes after the party.
- I gave my neighbor a quick goodbye and went inside.
- She waved goodbye from the front porch.
Notice that goodbye works both as the actual farewell expression and as a noun referring to the farewell itself.
Dictionary-Style Word Details
Verb
- Goodbye: Not commonly used as a verb in standard US English.
- Good bye: Not a standard modern verb. Separating the expression does not create a separate verb.
Noun
- Goodbye: A noun referring to a farewell or act of parting. Its plural is goodbyes. Major dictionaries document this noun use.
- Good bye: When encountered as an older spelling, it can represent the same farewell idea, but it is not the normal modern noun spelling.
Synonyms
- Goodbye: Closest plain alternatives include farewell, parting, and leave-taking, depending on context.
- Good bye: When used as a historical variant, it carries the same basic farewell sense, so the same closest plain alternatives can apply.
There is no useful separate synonym set created simply by inserting a space.
Example Sentences
- Goodbye: “Goodbye, Maya. I’ll see you tomorrow.”
- Goodbye: “They shared a quick goodbye outside the restaurant.”
- Good bye: This spaced form may be encountered in older material, but modern writers normally use goodbye instead.
Word History
Goodbye developed from an older farewell expression meaning “God be with you.” Merriam-Webster gives a first known use of 1575, while Oxford describes the word as a contraction with good substituted under the influence of other farewell expressions.
The written expression has appeared in different forms historically. That history helps explain why readers may still encounter spacing or hyphenation in older sources.
Phrases Containing
- say goodbye — “We said goodbye after dinner.”
- say your goodbyes — “They said their goodbyes before the trip.”
- wave goodbye — “She waved goodbye from the window.”
- kiss goodbye — “He kissed his children goodbye.”
- goodbye to something — used when describing giving something up or accepting its loss.
These established patterns use goodbye as the modern written form.
FAQs
Is “goodbye” one word?
Yes, goodbye is normally written as one word in modern US English. It is the established spelling used in current dictionaries and ordinary writing. The word can function as an interjection when saying farewell and as a noun when referring to the farewell itself.
Is “good bye” correct in modern US English?
Good bye is not the normal modern spelling. It can appear in older or historically reproduced material, so readers may encounter it in books or quotations. For contemporary American writing, however, the established one-word form is the safer and more natural choice.
Are “goodbye” and “good bye” interchangeable?
They can communicate the same basic farewell when the spaced form appears as a historical variant, but they are not equally suitable in current writing. Goodbye is the established modern form, while good bye is unusual in contemporary standard prose.
Can “goodbye” be used in formal writing?
Yes. Goodbye is not limited to casual conversation. It can appear naturally in professional, academic, literary, and other formal contexts whenever a farewell is being discussed or expressed. The surrounding sentence determines the overall tone more than the word itself.
Is “goodbye” a noun or an interjection?
It can be both. As an interjection, it directly expresses farewell: “Goodbye!” As a noun, it names the farewell or act of parting: “Their goodbye was emotional.” Dictionaries document both grammatical uses.
What is the plural of “goodbye”?
The standard plural is goodbyes. For example, “They exchanged goodbyes before boarding the plane.” No apostrophe is needed because the ending simply takes the regular plural -s. The one-word plural follows the modern spelling of the noun.
Conclusion
For modern American English, choose goodbye.
The two-word form good bye can be found in historical or older writing, but it is not the normal form for contemporary prose. The meaning is essentially the same when the older form appears; the practical difference is its written status.
So when you are writing an email, text, assignment, article, or everyday sentence, use goodbye as one word.
