The rare daily word game sweeping the globe. Find what's hidden in plain sight.
COSINE
Definition of COSINE
noun
In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse. Symbol: cos
Wiktionary · CC BY-SA
Where it comes from
From co- + sine, short for complementi sinus in Latin, meaning “sine of the complement”. Doublet of cosinus.
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- Latin
- English
One recorded step before English.
Deepest traced root
1st
of 59 source languages in OUTLIER
30.7%
of traced words share this origin (23,914)
branch · 30.7% of traced words
How it is built
Same root, COSINE · 1 relative in the game
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
COSINE in OUTLIER
Players have found it on 82 boards so far. 228 players have found it across Outlier's history.
It first turned up on Day 7, 28 May 2026. The most recent board was Day 155, 22 October 2026. It was on the latest finished board.
First found by a player on Day 7, 28 May 2026.
Built from these letters
COSINE starts with C and ends with E. Sorted, its letters read CEINOS - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Same letters, different word
3 other words use exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Words that start COSINE
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 7
Could you have found COSINE?
OUTLIER is a daily word game. One grid, the same grid for everybody, and the words nobody else spots are the ones that pay. This word was on Day 7 - and most players walked straight past it.
Play today's OUTLIER