unlesss

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Definition of unlesss in English English dictionary

Precisely unless

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”.).

Etymology

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