af

abbreviation

Definition of af

affix

AF

abbreviation

Definition of AF

1 air force
2 audio frequency

af-

prefix

Definition of af-

— see ad-

Medical Dictionary

AF

abbreviation

medical Definition of AF

2 audio frequency

Seen and Heard

What made you want to look up af? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to make or become suitable or fit

Get Word of the Day daily email!

Test Your Vocabulary

Winter Words Quiz

  • fox-in-front-of-cabin-in-winter
  • Another word for ‘a person who travels to an area of warmth and sun, especially in winter’ is a:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!