Meaning of G in English

G BrE AmE , g /dʒiː/ noun ( plural G’s , g’s )

1 . [uncountable and countable] the seventh letter of the English alphabet

2 . [uncountable and countable] the fifth note in the musical ↑ scale of C ↑ major or the musical ↑ key based on this note

3 . [singular, uncountable] American English used to describe a film that has been officially approved as suitable for people of any age SYN U British English ⇨ PG

4 . [countable] technical a unit for measuring the force caused by ↑ gravity on an object as it starts to move faster and faster:

Astronauts endure a force of several G’s during take-off.

high g-forces

5 . [uncountable] American English a ↑ grand (=$1,000)

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.