\ ˈfī
\
\
Definition of phi
: the 21st letter of the Greek alphabet — see Alphabet Table
Learn More About phi
From the Editors at Merriam-Webster
Going Greek: 7 Words from the Greek...
Going Greek: 7 Words from the Greek Alphabet
When English borrows from another alphabet
Statistics for phi
Look-up Popularity
Cite this Entry
“Phi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phi. Accessed 5 Jul. 2022.
Style: MLA
MLA
Chicago
APA
Merriam-Webster
Chicago
APA
Merriam-Webster
Test Your Vocabulary
Odd Habits and Quirks
-
- Which of the following best describes an easily irritated person?
Test your vocabulary with our 10-question quiz!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
-
Brand Name Vocabulary Quiz
You’re gonna need some moxie to ace this quiz
Take the quiz
-
Commonly Confused Words Quiz
Take a (break/brake) and (pore/pour) over this (c...
Take the quiz
-
How Strong Is Your Vocabulary?
Test your vocabulary with our 10-question quiz!
Take the quiz
-
Spelling Bee Quiz
Can you outdo past winners of the National Spelli...
Take the quiz
Share phi
Time Traveler for phi
The first known use of phi was in the 15th century
See more words from the same century