l

UK: 'L', 'l': /ˈɛl/ US: 'L', 'l': /ɛl/ ,'L', 'l': (el)

Collins Concise English Dictionary © HarperCollins Publishers::

l, L / ɛl/ noun (l's, L's, 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. something shaped like an L
4. (in combination): an L-shaped room

l symbol

1. litre

WordReference Random House Learner's Dictionary of American English © 2026

L, l /ɛl/   n. [countable] , pl. Ls or L's, ls or l's. 

1. Linguistics the 12th letter of the English alphabet, a consonant.

L,  an abbreviation of:

1. large.
2. left.
3. Weights and Measures length.
4. long.
5. Geography longitude.

L,  Symbol.

1. Mathematics (sometimes l.c.) the Roman numeral for 50.

l,  an abbreviation of:

1. large.
2. Weights and Measures liter.

L.,  an abbreviation of:

1. lady.
2. lake.
3. large.
4. Geography latitude.
5. left.
6. Liberal.
7. low.

l.,  an abbreviation of:

1. left.
2. Weights and Measures length.
3. pl. ll., line.
4. Weights and Measures liter.

WordReference Random House Learner's Dictionary of American English © 2026

ˈRo•man ˈnu•mer•al,  n. [countable]

1. any of the numerals in the ancient Roman system of notation, still used occasionally. The basic symbols are I (=1), V (=5), X (=10), L (=50), C (=100), D (=500), and M (=1000).

WordReference Random House Unabridged Dictionary of American English © 2026

L, l  (el), n., pl. 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 anL.
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.

L  (el), n., pl. L's or Ls. [Informal.]

1. Building, Transport, Informal Terms an elevated railroad.

L  (el), n., pl. L's or Ls. 

1. ell¹.

L, 

1. Optics lambert;
   lamberts.
2. Linguistics language.
3. large.
4. Latin.
5. Biochemistry left.
6. Weights and Measures, Business length.
7. British Terms pound;
   pounds. [ L lībra]
8. long: denoting a size longer than regular, esp. for suits and coats made for tall men:
   40L.
9. longitude.
10. Show Business [Theat.] stage left.

L,  Symbol.

1. the 12th in order or in a series, or, if I is omitted, the 11th.
2. (sometimes l.c.) the Roman numeral for 50. Cf. Roman numerals.
3. [Elect.] inductance.
4. [Physics.] See kinetic potential. 
5. Biochemistry leucine.
6. Economics a broad measure of total U.S. liquid assets, issued periodically by the Federal Reserve Board. Cf. M.

l, 

1. large.
2. Weights and Measures liter;
   liters.

l-,  Symbol, Optics, Chem., Biochem.

1. Biochemistry levorotatory;
   levo- (distinguished from d-). Cf. l-.

l-, [Symbol, Biochem.]

1. Biochemistry (of a molecule) having a configuration resembling the levorotatory isomer of glyceraldehyde: printed as a small capital, roman character (disting. from d-). Cf. l-. 

L-, 

1. Chemistry levo-.
2. Military [U.S. Mil.] (in designations of light aircraft) liaison:
   L-15.

L., 

1. Lady.
2. Lake.
3. large.
4. Latin.
5. Geography latitude.
6. law.
7. left.
8. lempira;
   lempiras.
9. leu;
   lei.
10. lev;
    leva.
11. book.
• Latin liber
12. Liberal.
13. Currency (in Italy) lira;
    lire.
14. place.
• Latin liber
15. Lord.
16. Low.
17. lumen.
18. Show Business [Theat.] stage left.

l., 

1. large.
2. Geography latitude.
3. law.
4. leaf.
5. league.
6. left.
7. Weights and Measures length.
8. pl. ll., line.
9. link.
10. Currency (in Italy) lira;
    lire.
11. Weights and Measures liter;
    liters.
12. long.

WordReference Random House Unabridged Dictionary of American English © 2026

Ro′man nu′merals, 

1. the numerals in the ancient Roman system of notation, still used for certain limited purposes, as in some pagination, dates on buildings, etc. The common basic symbols are I (=1), V (=5), X (=10), L (=50), C (=100), D (=500), and M (=1000). The Roman numerals for one to nine are: I, II, III, IV, V, VI, VII, VIII, IX. A bar over a letter multiplies it by 1000;
   thus, X̄ equals 10,000. Integers are written according to these two rules: If a letter is immediately followed by one of equal or lesser value, the two values are added;
   thus, XX equals 20, XV equals 15, VI equals 6. If a letter is immediately followed by one of greater value, the first is subtracted from the second;
   thus, IV equals 4, XL equals 40, CM equals 900. Examples: XLVII(=47), CXVI(=116), MCXX(=1120), MCMXIV(=1914). Roman numerals may be written in lowercase letters, though they appear more commonly in capitals.

• 1725–35

Collins Concise English Dictionary © HarperCollins Publishers::

L symbol

1. lambert(s)
2. large
3. Latin
4. (on British motor vehicles) learner driver
5. length
6. live
7. pound
   Usually written: £
8. lire
9. inductor (in circuit diagrams)
10. latent heat
11. self-inductance
12. (Roman numeral) 50
    See Roman numerals

abbreviation

1. Luxembourg (international car registration)

Etymology: (for sense 8a) Latin libra pound

Collins Concise English Dictionary © HarperCollins Publishers::

L., l. abbreviation

1. lake
2. left
3. length