The rare daily word game sweeping the globe. Find what's hidden in plain sight.
SIMPLEX
Definition of SIMPLEX
adjective
Having a single structure; not composite or complex; undivided, unitary.
Wiktionary · CC BY-SA
Where it comes from
The adjective is a learned borrowing from Latin simplex (“plain, simple; single”). The first part, sim-, comes from Proto-Indo-European *sem-, *sm̥- (“one; together”). The second part, -plex, may be from *pleḱ- (“to weave”). The noun is derived from the adjective. The plural forms simplices and simplicia are learned borrowings from Latin simplicēs (masculine or feminine) and simplicia (neuter), respectively plural forms of simplex. Noun sense 1 (“generalization of a triangle or tetrahedron to an arbitrary dimension”) was apparently coined by the Dutch mathematician Pieter Hendrik Schoute (1846–1913) as a short version of Simplicissimum in Mehrdimensionale Geometrie (in German, 1902). (In his pioneering works on algebraic topology, the French mathematician Henri Poincaré (1854–1912) had previously introduced the concept, but not the actual term simplex.)
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
4 recorded generations before English.
Deepest traced root
5th
of 58 source languages in OUTLIER
7.2%
of traced words share this origin (2,081)
branch · 15.4% of traced words
How it is built
Its etymology also names German.
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
SIMPLEX in OUTLIER
Players have found it on 19 boards so far. 92 players have found it across Outlier's history.
It first turned up on Day 32, 21 June 2026. The most recent board was Day 144, 11 October 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 32, 21 June 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
SIMPLEX starts with S and ends with X. Sorted, its letters read EILMPSX - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram. It uses X - among the least common letters in written English.
Words that start SIMPLE
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 32
Could you have found SIMPLEX?
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 32 - and most players walked straight past it.
Play today's OUTLIER