Meanings
- human sciencesPrecisely unless.
1990, James Glimm, The Legacy of John Von Neumann, American Mathematical Society, →ISBN, page 279, Partial Order: G ≥ H unlesss (unless and only unless) H ≥ some Gᴿ or some Hᴸ ≥ G.
2 more examples
A subset S is called absorbing if to each x#92;inX there is a real number #92;epsilon#61;#92;epsilon#95;xgt;0 such that #92;lambdax#92;inS for all #92;lambda with 0lt;#92;left#124;#92;lambda#92;right#124;#92;le#92;epsilon. Trivially the set X is absorbing; on the other hand #92;#123;0#92;#125; can never be absorbing (unlesss X#61;#92;#123;0#92;#125;).
1999, V. K. Balachandran, Topological Algebras, North-Holland, published 2000, →ISBN, pages 78–792004, William Fraser, Susan Hirshberg, and David Wolfe, "The Structure of the Distributive Lattice of Games Born by Day n", in Integers: Electronic Journal of Combinatorial Number Theory 5(2) (2005), page 2, G ≥ H unlesss H ≥ Gᴿ or Hᴸ ≥ G for some Gᴿ ∈ Gᴿ or some Hᴸ ∈ Hᴸ. ¶ (Analogous to “iff”, the term “unlesss” means “unless and only unless”.)
Synonyms & antonyms
Origin
Attributed to John Horton Conway. From unless, by analogy with the formation of iff from if.
Full word history & related roots →Rhymes & wordplay
Anagrams
Cite this entry
unlesss. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/unlesss
“unlesss.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/unlesss. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “unlesss,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/unlesss.
Source: unlesss on Wiktionary, CC BY-SA 4.0.