Midday or Mid-day: Which Is Correct?

Updated 2026-10-12 · Which One Is Correct editorial team

Quick answer: The correct spelling for noon or the middle of the day is midday as one single word. While mid-day appears occasionally, it is considered a less common variant that is not standard in most modern writing. You should always use the one-word version for clarity and adherence to standard grammar rules.

The Short Answer

Midday is the standard spelling for noon or the middle of the day, while mid-day is a less common variant that should be avoided. People often confuse these forms because the prefix mid suggests a separation that makes the hyphenated version look logical to some readers.

This confusion arises from the tendency to break compound words into their component parts. However, English evolution has solidified midday as the proper form, similar to how other time-related terms have shifted away from hyphenation over time.

Side-by-Side Comparison

Form	Status	Use it when
midday	Standard	Writing any text about noon
mid-day	Less common	Rarely, perhaps in old texts
noun	Part of speech	Refers to a specific time
adverb	Part of speech	Used to modify verbs like arrive

Correct Example Sentences

We will meet at midday for our lunch break.
The sun is highest in the sky at midday.
Please schedule the conference call for midday.
She prefers to exercise during midday hours.
The temperature peaks around midday every summer.
Midday is often the busiest time in the office.
The baker starts selling pastries at midday.
Traffic usually clears up by midday.
We finished the project right at midday.
Midday offers the best lighting for outdoor photos.

Common Mistakes and Fixes

The meeting starts at mid-day.: The meeting starts at midday.
I arrived just after mid-day.: I arrived just after midday.
The event was cancelled due to mid-day rain.: The event was cancelled due to midday rain.
Please call us by mid-day.: Please call us by midday.
The store closes at mid-day.: The store closes at midday.
They serve soup at mid-day.: They serve soup at midday.

A Quick Test You Can Use

To determine the correct spelling, remember that midday acts as a single concept representing a specific point in time, much like afternoon or morning. When the word refers to the middle of the day without any need to emphasize a separate part, it should always be written without a hyphen as one unified word.

Related Word Pairs

Sunrise vs Sun rise: Write sunrise as one word for the event.
Sunset vs Sun set: Write sunset as one word for the event.
Moonrise vs Moon rise: Write moonrise as one word for the event.
Morning vs Morn-ing: Always write morning as one word.
Afternoon vs After noon: Write afternoon as one word.

Frequently Asked Questions

Why do some people write mid-day with a hyphen?

Some writers use a hyphen because they view the word as two distinct parts, mid and day. However, standard English usage has evolved to treat it as a single compound word, making the hyphenated version incorrect in most modern contexts.

Is mid-day ever acceptable in formal writing?

No, mid-day is generally considered incorrect in formal writing. You should always use the standard spelling of midday as one word to ensure your text appears professional and follows established grammar rules.

Can I use midday as an adverb?

Yes, you can use midday as an adverb to indicate when something happens. For example, the train arrives at midday or we finish work at midday, functioning identically to how you would use other time expressions.

What is the difference between midday and noon?

While they often refer to the same time, noon is a specific moment, whereas midday can refer to the entire period around noon. Midday is the broader term for the middle of the day, but both are commonly used interchangeably.