What is the meaning of the word "f"?

Definitions:

  1. Abbreviation for 'Fahrenheit'. copy to clipboard NOUN
    • Temperatures in the United States are commonly measured in degrees Fahrenheit, abbreviated as 'F'. copy to clipboard
  2. In military: abbreviation for 'Fighter', used in designation of aircraft. copy to clipboard NOUN
    • "The F-16 Fighting Falcon is renowned for its versatility and has been a cornerstone of air forces around the globe. copy to clipboard
  3. The fourth note of the diatonic scale of C major. copy to clipboard NOUN
    • In the realm of music, 'F' signifies a distinct pitch, integral to the structure of the musical scale. copy to clipboard
  4. The sixth highest or lowest class of academic marks; also used to represent 'Fail'. copy to clipboard NOUN
    • In the American education system, an 'F' grade signifies failing and is the lowest possible grade a student can receive. copy to clipboard