at hour

USAGE SUMMARY

"at hour" is not a correct phrase in written English.
Instead, you can use the phrase "at the hour" or "at an hour." For example, "At an hour when many people were just waking up, he was already hard at work."

⚠ May contain grammatical issues

Science

News & Media

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

"At hour of sleep," he said, reciting from the hospital chart.

The New York Times - Health

In three hours of the varsity debate, someone should have been gone at hour one.

The Guardian - Opinion

But 15 milligrams at hour of sleep is what I need".

The New York Times - Health

Against educated instinct, I wrote a prescription: Haldol 15 milligrams at hour of sleep.

The New York Times - Health

Local demand level at hour t.

Journal of Modern Power Systems and Clean Energy

PV generation/exporting at hour t.

Journal of Modern Power Systems and Clean Energy

Electricity from retailer at hour t.

Journal of Modern Power Systems and Clean Energy

1) The load at hour t is less than the load at hour t − 1. 2) The unit is off status at hour t − 1.

Journal of Modern Power Systems and Clean Energy

Charge/discharge rate of ES at hour t.

Journal of Modern Power Systems and Clean Energy

1) The load at hour t is less than the load at hour t − 1. 2) The unit is off status at hour t − 1. 1) The load at hour t is less than the load at hour t − 1. 2) The unit is off status at hour t − 1.

Journal of Modern Power Systems and Clean Energy

Take the unit i committed at hour t and the unit j committed at hour t + 1 shown in Fig. 1 for example.

Journal of Modern Power Systems and Clean Energy

Expert writing Tips

Best practice

When precision is needed, clarify the specific time within the hour. For example, instead of just saying "at hour 3", specify "at 3:15 PM".

Common error

Avoid omitting the article (the/an) before "hour". Saying just "at hour" is generally considered grammatically incorrect. Always use "at the hour" or "at an hour" to improve clarity and correctness.

Linguistic Context

The phrase "at hour" functions as an adverbial phrase indicating when something occurs. Though common, it's considered grammatically incorrect. Ludwig AI highlights the need for an article ("the" or "an") for correct usage.

Expression frequency: Very common

Frequent in

Science

76%

News & Media

19%

Formal & Business

5%

Less common in

Ludwig's WRAP-UP

While the phrase "at hour" is frequently found, particularly in scientific and news contexts, Ludwig AI signals that it's grammatically incorrect. The absence of the article "the" or "an" creates this issue. For precise and grammatically sound writing, it is recommended to use "at the hour" or "<a href="/s/at+an+hour" instead. Remember to specify the time more accurately and to avoid omitting the article to enhance clarity and correctness in your writing. While commonly used, its best to avoid using "at hour".

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

at the hour of

Adds definiteness, making it grammatically correct.

at an hour when

Specifies a point in time using a relative clause.

during that hour

Emphasizes duration within a specific hour.

within the hour

Implies completion or occurrence before the end of the hour.

at that time

Offers a more general reference to a specific moment.

on the hour

Refers to the start of an hour, often precisely.

hourly

As an adverb, it describes something that happens every hour.

every hour

Highlights the recurrence of an event each hour.

at a specific time

More general than "at hour", referring any particular moment.

during the specified hour

Adds emphasis on a previously mentioned time.

FAQs

How can I correctly use "at hour" in a sentence?

While "at hour" is often seen, it's better to use "at the hour" or "at an hour". For example, "The experiment began at the hour of midnight."

What's a more grammatically sound alternative to "at hour"?

Alternatives include "at the hour", "at an hour", or "during that hour", each adding clarity and correctness depending on the situation.

Is there a difference between using "at hour", "at the hour", and "at an hour"?

"At hour" is grammatically incorrect. "At the hour" specifies a particular, often known, time. "At an hour" refers to a non-specific time.

In what situations might I encounter the phrase "at hour"?

You might find "at hour" in technical writing, especially in scientific or engineering contexts. However, "at the hour" or "at an hour" are always better choices for accuracy.