L definition and meaning | Collins English Dictionary (2025)

L

also l (el ) (plural L's, l's )

1.variable noun A1

L is the twelfth letter of the English alphabet.

2.variable noun

L is the symbol for 'learner driver' in Britain. A large red 'L' on a white background is attached to cars in which people are learning to drive.

3. B1

L or l is used as an abbreviation for words beginning with l, such as 'litre' and 'lire'.

Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers

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l in British English 1

or L (ɛl )

nounWord forms: plural l's, L's or Ls

1.

the 12th letter and ninth consonant of the modern English alphabet

2.

a speech sound represented by this letter, usually a lateral, as in label

3.

a.

something shaped like an L

b.

(in combination)

an L-shaped room

Collins English Dictionary. Copyright © HarperCollins Publishers

l in British English 2

symbol for

1.

litre

2. physics

lepton number

Collins English Dictionary. Copyright © HarperCollins Publishers

L in British English

symbol for

1.

ell (unit)

2.

lambert(s)

3.

large

4.

Latin

5.

(on British motor vehicles) learner driver

6. physics

length

7.

live

8. currency

a.

pound

Usually written: £

b.

lempira

c.

lek

d.

leu

e.

lire

9. aeronautics

lift

10. electronics

inductor (in circuit diagrams)

11. physics

latent heat

12. physics

self-inductance

13. chemistry

the Avogadro constant

14.(Roman numeral)

50

See Roman numerals

abbreviation for

15.

Luxembourg (international car registration)

Collins English Dictionary. Copyright © HarperCollins Publishers

Word origin

(for sense 8a) Latin libra pound

L. in British English

or l.

abbreviation for

1.

lake

2.

left

3.

length

Collins English Dictionary. Copyright © HarperCollins Publishers

L in American English 1

(ɛl )

nounWord forms: plural L's

1. US

an extension of a building that gives the whole a shape resembling L; ell

2.

a Roman numeral for 50: with a superior bar (), 50,000

3. US

an elevated railroad

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Word origin

(sense 3) for el, short for elevate verb transitive

L in American English 2

1.

lake

2.

lambert(s)

3.

large

4. Physics

latent heat

5.

Latin

6.

left

7.

length

8.

lira; lire

9.

liter(s)

10. American Football

lineman

: sometimes written l

11.

lobby

12.

longitude

13.

loss(es)

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

L in American English 3

1.

Avogadro constant

2. Electricity

inductance

3. British

pound(s) sterling

now usually £

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Word origin

(sense 3) L libra, pl. librae

l in American English 1

(ɛl ) or L (ɛl )

nounWord forms: plural L's or l's

1.

the twelfth letter of the English alphabet: from the Greek lambda, a borrowing from the Phoenician

2.

any of the speech sounds that this letter represents, as, in English, the (l) of love

3.

a type or impression for l or L

4.

the twelfth in a sequence or group

5.

an object shaped like L

adjective

6.

of l or L

7.

twelfth in a sequence or group

8.

shaped like L

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

l in American English 2

1.

land

2.

large

3.

latitude

4.

law

5.

leaf

6.

league

7.

left

8.

length

9.

line

10.

link

11.

lira; lire

12.

liter(s)

13.

long

14.

loss(es)

15. British

pound(s) sterling

now usually £

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Word origin

(sense 15) L libra, pl. librae

L- in American English

having an asymmetrical, left-handed spatial arrangement of atoms

usually printed as a small capital

L-glucose

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

l- in American English

levorotatory

usually printed in italic type [l-limonene]: now usually symbolized by a minus sign (−)

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

l in American English

abbreviation

1.

large

2.

liter; liters

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

L in American English

(el) or l (el)

nounWord forms: plural L's or Ls, l's or ls

1.

the 12th letter of the English alphabet, a consonant

2.

any spoken sound represented by the letter L or l, as in let, dull, cradle

3.

something having the shape of an L

4.

a written or printed representation of the letter L or l

5.

a device, as a printer's type, for reproducing the letter L or l

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

L in American English 1

(el)

nounWord forms: plural L's or Ls

informal

an elevated railroad

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

L in American English 2

(el)

nounWord forms: plural L's or Ls

ell1

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

L in American English 3

abbreviation

1.

lambert; lamberts

2.

language

3.

large

4.

Latin

5.

left

6.

length

7.Brit

pound; pounds

8.

long: denoting a size longer than regular, esp. for suits and coats made for tall men

40L

9.

longitude

10.Theater

stage left

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

Word origin

[(def. 7) ‹ L lībra]

L in American English 4

symbol

1.

the 12th in order or in a series, or, if I is omitted, the 11th

2.(sometimes lc)

the Roman numeral for 50

Compare Roman numerals

3.Electricity

inductance

4.Physics See kinetic potential

5.Biochemistry

a white, crystalline, water-soluble amino acid, C6 H13NO2, obtained by the decomposition of proteins and made synthetically: essential in the nutrition of humans and animals; leucine

6.Economics

a broad measure of total U.S. liquid assets, issued periodically by the Federal Reserve Board

Compare M1

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

l. in American English

abbreviation

1.

large

2.

latitude

3.

law

4.

leaf

5.

league

6.

left

7.

length

8.Word forms: plural ll.

line

9.

link

10.(formerly in Italy)

lira; lire

11.

liter; liters

12.

long

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

L. in American English

abbreviation

1.

Lady

2.

Lake

3.

large

4.

Latin

5.

latitude

6.

law

7.

left

8.

lempira; lempiras

9.

leu; lei

10.

lev; leva

11.

book

12.

Liberal

13.(formerly in Italy)

lira; lire

14.

Lord

15.

Low

16.

lumen

17.

place

18.Theater

stage left

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

Word origin

[(def. 11) ‹ L liber; (def. 17) ‹ L locus]

L- in American English

prefix

1.Chemistry

levo-

2. U.S. Military (in designations of light aircraft)

liaison

L-15

Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd

Word lists with

l

international car registration letters

L definition and meaning | Collins English Dictionary (2025)
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