Merriam-Webster Logo
SINCE 1828
Menu
×

An Encyclopædia Britannica Company

See What's Trending Now See More Trending Words

H hour

noun

Definition of H hour

:the hour set for launching a specific tactical operation

People Are Reading

alt-59e900afadac6
The Synonyms 'Discover' and 'Invent'
one-green-toy-robot-amidst-many-red-toy-robots
The Exceptions Quiz III
tycoon
17 English Words that Come From Japanese
video-title-words-of-the-year-1066
Words of the Year: 1066

Origin and Etymology of h hour

H, abbreviation for hour

Learn More about h hour

  1. See words that rhyme with H hour

Seen and Heard

What made you want to look up H hour? Please tell us where you read or heard it (including the quote, if possible).

show hide

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

knee-jerk

play

readily predictable

Get Word of the Day daily email!

TRENDING NOW

  1. imbroglio "a public scandal"

  2. spurious of a deceitful nature or quality

  3. righteous We provide an assortment of definitions

  4. Kafkaesque 'A nightmarish quality'

  5. mike "microphone"

SEE ALL

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

alt-59e900afadac6
The Synonyms 'Discover' and 'Invent'

In the past, you could invent fruit.

alt-59e8c3440f453
I'll Have the Us(ual)

Shortening 'usual': easy to say, hard to spell

alt-59e77dc36c593
The Origins of 'Lobbyist'

From the front hallways to the back rooms

alt-59e673567065d
The History of the Word 'Terrorism'

Noah Webster first entered the term in 1840

Ask the Editors

video-title-words-of-the-year-1066
Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

payday
How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless
Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals
Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

one-green-toy-robot-amidst-many-red-toy-robots
The Exceptions Quiz III

Which of these things doesn't belong?

Take the quiz
knupfer-painting-solon-before-croesus
Forms of Government Quiz

Name that government! Or something like that.

Take the quiz
How Strong Is Your Vocabulary?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Take the quiz
Citation
Citation

Do you know the person or title these quotes describe?

Play the game