unlesss

Etymology
Attributed to John Horton Conway. From, by analogy with the formation of from.

Conjunction

 * 1)  Precisely unless.
 * 2) * 1990, James Glimm, The Legacy of John Von Neumann, American Mathematical Society, ISBN 0821814877, page 279,
 * Partial Order: G ≥ H unlesss (unless and only unless) H ≥ some GR or some HL ≥ G.
 * 1) * 2004, 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 ∈ G R or some HL ∈ H L. ¶ (Analogous to “iff”, the term “unlesss” means “unless and only unless”.)
 * G ≥ H    unlesss H ≥ GR or HL ≥ G for some GR ∈ G R or some HL ∈ H L. ¶ (Analogous to “iff”, the term “unlesss” means “unless and only unless”.)