The rare daily word game sweeping the globe. Find what's hidden in plain sight.
ARCCOSINE
Definition of ARCCOSINE
noun
Any of several single-valued or multivalued functions that are inverses of the cosine function.
Wiktionary · CC BY-SA
Where it comes from
From arc- + cosine.
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
Same root, ARCCOSINE · 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.
ARCCOSINE in OUTLIER
Players have found it on 2 boards so far.
It first turned up on Day 139, 6 October 2026. The most recent board was Day 140, 7 October 2026. Nobody has seen it on a board for 10 days.
First ever to find it
on Day 139, 6 October 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
ARCCOSINE starts with A and ends with E. Sorted, its letters read ACCEINORS - the shape to hunt for when the grid is scrambled. C appears more than once, including a double letter.
Same letters, different word
One other word uses exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Could you have found ARCCOSINE?
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 139 - and most players walked straight past it.
Play today's OUTLIER