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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
plus one
Grammar usage guide and real-world examplesUSAGE SUMMARY
"plus one" is a correct and usable phrase in written English.
You can use it in informal writing when you want to add an additional person (or thing) to a list, e.g. "I'm bringing my friends Robert, Sarah, and plus one."
✓ Grammatically correct
News & Media
Science
Alternative expressions(4)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
56 human-written examples
"Time: Plus Twelve.
News & Media
"Kate Eric: One Plus One Minus One".
News & Media
One plus one equals zero.
News & Media
One plus one is two.
News & Media
He was the plus one.
News & Media
Six steps plus one step = seven steps.
News & Media
It is an ensemble piece plus one and Evans is very much the plus one.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
4 human-written examples
A plus-one format?
News & Media
Paul We each get a plus-one.
News & Media
Four hundred, all with a plus-one.
News & Media
Depression was identified by diagnosis code plus ≥ one antidepressant prescription.
Expert writing Tips
Best practice
When using "plus one" in invitations, clearly state whether guests are allowed to bring a "plus one" to avoid confusion. For instance, include "Individual tickets only, no plus ones" or "Each invite admits you and a plus one."
Common error
Avoid automatically assuming everyone wants to bring a "plus one". Some people prefer attending events solo. Always clarify if bringing a guest is optional, not expected.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "plus one" functions primarily as a noun phrase, denoting an additional person invited to an event or a numerical increment. Ludwig confirms its acceptability in written English. It modifies the quantity or attendance, indicating an extra individual.
Frequent in
News & Media
70%
Science
15%
Formal & Business
5%
Less common in
Encyclopedias
3%
Wiki
2%
Social Media
1%
Ludwig's WRAP-UP
In summary, "plus one" is a common and generally accepted phrase used to indicate an additional guest or numerical increment. As verified by Ludwig, it is grammatically correct and widely used across various contexts, primarily in news and media. While its register leans toward neutral to informal, more formal alternatives like "additional guest" may be preferred in professional settings. Use "plus one" confidently in invitations or general discussions about additions, but clarify its intended meaning to avoid confusion. Remembering these best practices ensures clear and effective communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
additional guest
This phrase directly refers to an extra person invited, emphasizing their role as a guest.
extra person
A simple and direct way to refer to an additional individual, suitable for informal contexts.
a companion
Focuses on the accompanying aspect, implying a friend or partner.
an accompanying person
More formal, suitable for official invitations or event planning.
an added guest
Emphasizes the act of adding a guest to the list.
another invitee
Highlights the person's status as someone who has been invited.
a tagalong
Informal and can sometimes imply the person wasn't explicitly invited.
an appendage
Humorous or slightly derogatory way to describe someone accompanying.
the other half
Typically used in romantic contexts to refer to a partner.
plus an associate
Suggests a more professional or business-related context for the additional person.
FAQs
How can I use "plus one" in a sentence?
You can use "plus one" to indicate an additional guest or item. For example, "Each member can bring a "plus one" to the event" or "The formula requires variable X "plus one" for accurate calculation".
What is another way to say "plus one"?
Alternatives to "plus one" include "additional guest", "extra person", or "a companion", depending on the context.
Is it correct to use "plus one" in formal writing?
While "plus one" is widely understood, it is generally considered informal. In formal writing, it is better to use more precise language such as "additional guest" or "an accompanying person".
What does it mean when an invitation says "plus one"?
When an invitation includes "plus one", it means you are invited and are welcome to bring one guest with you. However, be sure to RSVP for both yourself and your "plus one".
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested