inch

¹ American  

[inch] / ɪntʃ /

noun

1. a unit of length, 1/12 (0.0833) foot, equivalent to 2.54 centimeters. in.

2. a very small amount of anything; narrow margin.

   to win by an inch;

   to avert disaster by an inch.

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verb (used with or without object)

1. to move by inches or small degrees.

   We inched our way along the road.

idioms

1. every inch, in every respect; completely.

   That horse is every inch a thoroughbred.

2. within an inch of, nearly; close to.

   He came within an inch of getting killed in the crash.

3. by inches,

   1. narrowly; by a narrow margin.

      escaped by inches.

   2. Also inch by inch. by small degrees or stages; gradually.

      The miners worked their way through the narrow shaft inch by inch.

inch ² American  

[inch] / ɪntʃ /

noun

Scot.

1. a small island near the seacoast.

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inch ¹ British  

/ ɪntʃ /

noun

1. a small island

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inch ² British  

/ ɪntʃ /

noun

1. a unit of length equal to one twelfth of a foot or 0.0254 metre

2. meteorol

   1. an amount of precipitation that would cover a surface with water one inch deep

      five inches of rain fell in January

   2. a unit of pressure equal to a mercury column one inch high in a barometer

3. a very small distance, degree, or amount

4. in every way; completely

   he was every inch an aristocrat

5. gradually; little by little

6. very close to

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verb

1. to move or be moved very slowly or in very small steps

   the car inched forward

2. to defeat (someone) by a very small margin

inch Scientific  

/ ĭnch /

1. A unit of length in the US Customary System equal to 1/12 of a foot (2.54 centimeters).

2. See Table at measurement

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inch More Idioms  

More idioms and phrases containing inch

• by inches
• every inch
• give an inch
• within an ace (inch) of

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Etymology

Origin of inch¹

First recorded before 1000; Middle English inch(e), unch(e), enche, Old English ynce, from Latin uncia “twelfth part, inch, ounce”; see origin at ounce ¹

Origin of inch²

First recorded in 1400–50; late Middle English, from Scots Gaelic innse, genitive of innis “island,” Old Irish inis, cognate with Welsh ynys, Breton enez

Explanation

An inch is a small unit of measurement. Twelve inches makes one foot. You might get an inch of your hair cut off, or hem your jeans so they're an inch shorter. Some countries use centimeters and meters as units of measurement, but if you measure in inches, you can order a twelve inch pizza or print out three by five inch photos. When inch is used as a verb, it means "to creep slowly forward." The Old English version was ynce, from the Latin uncia, "a twelfth part."

Example Sentences

"We will continue on this path to liberate the last inch of Lebanon," she said.

From Barron's • Apr. 22, 2026

After this process, the crystal grew to about 100 nanometers, or roughly 250,000 times smaller than an inch.

From Science Daily • Apr. 20, 2026

Residents are also already required to keep grasses shorter than 4 inches; Zone Zero lowers this by an inch.

From Los Angeles Times • Apr. 18, 2026

"I got a three inch memory foam mattress pad so it felt just like my bed at home," Ali says.

From BBC • Apr. 17, 2026

Tess held up a lumpy pillowcase, and I felt myself relax the tiniest fraction of an inch.

From "Glitch" by Laura Martin