B definition and meaning | Collins English Dictionary (2025)

COBUILD frequency band

B

also b (b ) (plural B's, b's )

1.variable noun A1

B is the second letter of the English alphabet.

2.variable noun

In music, B is the seventh note in the scale of C major.

3.variable noun B1+

If you get a B as a mark for a piece of work or in an exam, your work is good.

4.

B or b is used as an abbreviation for words beginning with b, for example 'born'.

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

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COBUILD frequency band

b in British English 1

or B (biː )

nounWord forms: plural b's, B's or Bs

1.

the second letter and first consonant of the modern English alphabet

2.

a speech sound represented by this letter, usually a voiced bilabial stop, as in bell

3. Also: beta

the second in a series, esp the second highest grade in an examination

Collins English Dictionary. Copyright © HarperCollins Publishers

COBUILD frequency band

b in British English 2

symbol for

chess See algebraic notation

Collins English Dictionary. Copyright © HarperCollins Publishers

COBUILD frequency band

B in British English

symbol for

1. music

a.

a note having a frequency of 493.88 hertz (B above middle C) or this value multiplied or divided by any power of 2; the seventh note of the scale of C major

b.

a key, string, or pipe producing this note

c.

the major or minor key having this note as its tonic

2.

the supporting or less important of two things

the B side of an old single

3.

a human blood type of the ABO group, containing the B antigen

4.

(in Britain) a secondary road

5.

the number 11 in hexadecimal notation

6. chemistry

boron

7.

magnetic flux density

8. chess

bishop

9.

(on Brit pencils, signifying degree of softness of lead) black

B

2B

3B

Compare H (sense 5)

10. Also: b physics

bel

11. physics

baryon number

12.

balboa

13.

belga

14.

bolívar

15. photography

B-setting

16.

a.

a person whose job is in middle management, or who holds an intermediate administrative or professional position

b.

(as modifier)

a B worker

See also occupation groupings

abbreviation for

17.

Belgium (international car registration)

Collins English Dictionary. Copyright © HarperCollins Publishers

COBUILD frequency band

b. in British English

abbreviation for

1.

born

2. cricket

bowled

Collins English Dictionary. Copyright © HarperCollins Publishers

COBUILD frequency band

B. in British English

abbreviation for

1.

(on maps, etc) bay

2.

British

Collins English Dictionary. Copyright © HarperCollins Publishers

COBUILD frequency band

B- in British English

abbreviation for (of US military aircraft)

bomber

B-52

Collins English Dictionary. Copyright © HarperCollins Publishers

bomber in British English

(ˈbɒmə )

noun

1.

a military aircraft designed to carry out bombing missions

2.

a person who plants bombs

3. navy slang

a Polaris submarine

Collins English Dictionary. Copyright © HarperCollins Publishers

COBUILD frequency band

B in American English 1

(bi )

noun

1.

a blood type

see also ABO system

2. US, Education

a grade indicating above-average but not outstanding work

a B in French

3. Music

a.

the seventh note or tone in the ascending scale of C major

b.

the scale having this tone as the keynote

c.

a note representing this tone

d.

a key, string, etc. producing this tone

adjective

4. US

second-class; inferior to the best

a B film

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

COBUILD frequency band

B in American English 2

1.

bachelor

2.

bacillus

3. American Football

back

: sometimes written b

4. Baseball

a.

base

b.

baseman

c.

batter

5. Music

a.

bass

b.

basso

6.

battery

7.

Baumé

8.

bay

9. Physics

bel

10.

Bible

11.

billion

12. Chess

bishop

13.

bolívar

14.

book

15.

born

16.

brightness

17.

breadth

18.

British

19.

brother

20.

Brotherhood

Also, for 1-2, 4-6, 8, 10, 12-13, 16-17, & 19, b

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

COBUILD frequency band

B in American English 3

1. Chemistry

boron

2. Physics

magnetic flux density

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

COBUILD frequency band

b in American English 1

(bi ) or B (bi )

nounWord forms: plural B's or b's

1.

the second letter of the English alphabet: from the Greek beta, a borrowing from the Phoenician

2.

any of the speech sounds that this letter represents, as, in English, the (b) of boat

3.

a type or impression for b or B

4.

the second in a sequence or group

5.

an object shaped like B

adjective

6.

of b or B

7.

second in a sequence or group

8.

shaped like B

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

COBUILD frequency band

b in American English 2

1. Physics

a.

bar(s)

b.

barn(s)

2.

boliviano

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

COBUILD frequency band

B- in American English

(bi )

bomber

used in designations for aircraft

B-52

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

COBUILD frequency band

b in American English

abbreviation

1.Physics

a.

bar; bars

b.

barn; barns

2.

black

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

COBUILD frequency band

B in American English

(bi) b (bi)

nounWord forms: plural B's or Bs, b's or bs

1.

the second letter of the English alphabet, a consonant

2.

any spoken sound represented by the letter B or b, as in bid, bauble, or daubed

3.

something having the shape of a B

4.

a written or printed representation of the letter B or b

5.

a device, as a printer's type, for reproducing the letter B or b

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

COBUILD frequency band

B in American English 1

abbreviation

1.Chess

bishop

2.

black

3.Photography bulb (sense 8)

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

COBUILD frequency band

B in American English 2

symbol

1.

the second in order or in a series

2.(sometimes lc; in some grading systems)

a grade or mark, as in school or college, indicating the quality of a student's work as good or better than average

3.(sometimes lc; in some school systems)

a symbol designating the second semester of a school year

4.Physiology

a major blood group usually enabling a person whose blood is of this type to donate blood to persons of type B or AB and to receive blood from persons of type O or B

Compare ABO system

5.Music

a.

the seventh tone in the scale of C major or the second tone in the relative minor scale, A minor

b.

a string, key, or pipe tuned to this tone

c.

a written or printed note representing this tone

d.(in the fixed system of solmization)

the seventh tone of the scale of C major, called ti

e.

the tonality having B as the tonic note

6.(sometimes lc)

the medieval Roman numeral for 300

7.Chemistry

boron

8.

a proportional shoe width size, narrower than C and wider than A

9.

a proportional brassiere cup size, smaller than C and larger than A

10.Physics See magnetic induction

11.Electricity

susceptance

12.

a designation for a motion picture made on a low budget and meant as the secondary part of a double feature

13.

a quality rating for a corporate or municipal bond, lower than BB and higher than CCC

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

COBUILD frequency band

b. in American English

abbreviation

1.

bachelor

2.

bale

3.Baseball

base; baseman

4.

bass

5.

basso

6.

bay

7.

billion

8.

blend of; blended

9.

book

10.

born

11.

breadth

12.

brother

13.

brotherhood

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

COBUILD frequency band

B. in American English

abbreviation

1.

bachelor

2.

bacillus

3.Baseball

base; baseman

4.

bass

5.

basso

6.

bay

7.

Bible

8.

bolivar

9.

boliviano

10.

book

11.

born

12.

breadth

13.

British

14.

brother

15.

brotherhood

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

COBUILD frequency band

B- in American English

prefix

U.S. Military (in designations of aircraft)

bomber

B-52

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

Examples of 'b' in a sentence

b

These examples have been automatically selected and may contain sensitive content that does not reflect the opinions or policies of Collins, or its parent company HarperCollins.

We welcome feedback: report an example sentence to the Collins team. Read more…

Photos A, B, C and D are displayed in possible relative positions within the model.

Wall Street Journal (2023)

In Ward B, Janet Magnusson looked at him with disapproval.

Maclean, Alistair SAN ANDREAS

Not bad, Pitt thought, for a student who pulled a B- in the course.

Cussler, Clive INCA GOLD (1994)

Word lists with

b

text messaging international car registration letters abbreviations and symbols

B definition and meaning | Collins English Dictionary (2025)

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