length

American  

[lengkth, length, lenth] / lɛŋkθ, lɛŋθ, lɛnθ /

noun

1. the longest extent of anything as measured from end to end.

   the length of a river.

   Synonyms:

   measure, scope, reach, stretch, span

2. the measure of the greatest dimension of a plane or solid figure.

3. extent from beginning to end of a series, enumeration, account, book, etc..

   a report running 300 pages in length.

4. extent in time; duration.

   the length of a battle.

5. a distance determined by the extent of something specified.

   Hold the picture at arm's length.

6. a piece or portion of a certain or a known extent.

   a length of rope.

7. the quality or state of being long rather than short.

   a journey remarkable for its length.

8. the extent to which a person might or would go in pursuing something.

   He went to great lengths to get what he wanted.

9. a large extent or expanse of something.

10. the measure from end to end of a horse, boat, etc., as a unit of distance in racing.

    The horse won by two lengths.

11. Clothing. the extent of a garment related to a point it reaches, as on the wearer's body, the floor, or on a garment used as a standard of measurement (usually used in combination).

    an ankle-length gown; a floor-length negligee; a three-quarter-length coat.

12. Prosody, Phonetics.

    1. (of a vowel or syllable) quantity, whether long or short.

    2. the quality of vowels.

13. Bridge. the possession of four or more than four cards in a given suit.

14. Theater Archaic. 42 lines of an acting part.

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idioms

1. keep at arm's length. arm.

2. go to any length / lengths, to disregard any impediment that could prevent one from accomplishing one's purpose.

   He would go to any lengths to get his own way.

3. at length,

   1. in or to the full extent; completely.

   2. after a time; finally.

      At length there was a step forward in the negotiations.

length British  

/ lɛŋθ, lɛŋkθ /

noun

1. the linear extent or measurement of something from end to end, usually being the longest dimension or, for something fixed, the longest horizontal dimension

2. the extent of something from beginning to end, measured in some more or less regular units or intervals

   the book was 600 pages in length

3. a specified distance, esp between two positions or locations

   the length of a race

4. a period of time, as between specified limits or moments

5. something of a specified, average, or known size or extent measured in one dimension, often used as a unit of measurement

   a length of cloth

6. a piece or section of something narrow and long

   a length of tubing

7. the quality, state, or fact of being long rather than short

8. (usually plural) the amount of trouble taken in pursuing or achieving something (esp in the phrase to great lengths )

9. (often plural) the extreme or limit of action (in phrases such as to any length ( s ), to what length ( s ) would someone go, etc)

10. prosody phonetics the metrical quantity or temporal duration of a vowel or syllable

11. the distance from one end of a rectangular swimming bath to the other Compare width

12. prosody the quality of a vowel, whether stressed or unstressed, that distinguishes it from another vowel of similar articulatory characteristics. Thus ( iː ) in English beat is of greater length than ( ɪ ) in English bit

13. cricket the distance from the batsman at which the ball pitches

14. bridge a holding of four or more cards in a suit

15. informal the general idea; the main purpose

16. 1. in depth; fully

    2. eventually

    3. for a long time; interminably

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length More Idioms  

1. see at arm's length; at length; go to any length.

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Etymology

Origin of length

First recorded before 900; Middle English length(e), Old English lengthu; cognate with Dutch lengte, Old Norse lengd; see long ¹, -th ¹

Explanation

Length is a measurement of how long something is in time or space. You can measure the length of a table or the length of a movie. If an object has multiple distances to be measured (like a rectangle for example), then length is taken to be the longest of the measurements (as opposed to the width, in the case of the rectangle). Before babies learn to walk, they are measured for length, but once they begin to stand reliably the same measurement changes names, and become height.

Example Sentences

The sentence's length could see the 45-year-old being disqualified as an MP.

From BBC • Apr. 16, 2026

Even more signed petitions, some over 50 pages in length, demanding equal citizenship.

From Slate • Apr. 15, 2026

These sessions varied in length, lasting from under 15 seconds to more than five minutes.

From Science Daily • Apr. 14, 2026

But the length of the current conflict is unpredictable, and could yet trigger stress through “channels not yet fully apparent.”

From Barron's • Apr. 14, 2026

Meanwhile, Cassiopeia found a length of pink tulle in Madame LePoint’s trunk of fabric scraps, left over from a petticoat made for one of Lady Constance’s gowns.

From "The Long-Lost Home" by Maryrose Wood

Related Words

• breadth
• diameter
• dimension
• duration
• height
• limit
• magnitude
• mileage
• period
• piece
• portion
• quantity
• radius
• range
• section
• segment
• space
• span
• stretch
• term