Real Dictionary

G
countable noun: A G is a unit of measurement of the force resulting from acceleration. One G is equivalent to the force of the earth's gravitational pull.
variable noun: G is the seventh letter of the English alphabet.
variable noun: In music, G is the fifth note in the scale of C major.

G in American English
noun: the seventh letter of the English alphabet, a consonant

G in American English 1
one thousand dollars
the seventh letter of the English alphabet: from the Greek gamma, a borrowing from the Phoenician
abbreviation: general intelligence
abbreviation: grand: a sum of one thousand dollars

G in American English 2
a film rating meaning “general audience”: it indicates that the film is considered suitable for persons of all ages
acceleration of gravity
symbol
symbol: the seventh in order or in a series

G in American English 3
game(s)

G in American English 4
conductance

g in British English
noun: the seventh letter and fifth consonant of the modern English alphabet
symbol for: a note having a frequency of 392 hertz (G above middle C) or this value multiplied or divided by any power of 2; the fifth note of the scale of C major
symbol for: gallon(s)

g. in American English
abbreviation: gauge
abbreviation: German

G. in British English
abbreviation for: Gulf