Radian
6 lettersnounmoderateUpdated June 2026
Definition
The SI unit of plane angle, equal to the angle at the centre of a circle subtended by an arc whose length equals the radius, approximately 57.3 degrees.
“The mathematics teacher explained that a full circle contains approximately 6.28 radians.”
Pronunciation
IPA
/ˈreɪdiən/
Syllables
ra·di·an
Related Words
Synonyms
Word Game Tips
Wordle
Starts RADI and ends -AN, shares the RADI prefix with radial and radius
Scrabble
Three vowels (A-I-A) plus a useful N ending, good for clearing a vowel-heavy rack
Words Related to Radian
Words one letter different
Change a single letter of “radian” to make these 6-letter words — useful for Wordle and crossword clues.
Words you can make from Radian
Shorter words formed from the letters in “radian”.
Explore Similar Words
Try These Tools
Dictionary References
Look up radian in an authoritative dictionary for full definitions, pronunciation, and etymology.
Ready to test your word skills?
Download Word Challenge for unlimited word puzzles, a fresh Daily Challenge, and head-to-head multiplayer. Guess the hidden word in six tries or fewer!