Unlesss

conj

conj ·Rare ·Advanced level

Definitions

Conjunction
  1. 1
    Precisely 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."

Synonyms

All synonyms
precisely unlessprecisely unless

Example

More examples

"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."

Etymology

Attributed to John Horton Conway. From unless, by analogy with the formation of iff from if.

Related phrases

precisely unless

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.