non-logical connective/mekso operator - of arity only 1 xor 2: set (absolute) complement, or set exclusion (relative complement). Unary: X_{2 ^C}; binary: X_{1\setminusX}.

Each input must be a set or similar. The definition of the binary case expands to "the set of exactly those elements which are in X_{1} but not in X_{2}". This word and operator has ordered input: 'X_{1} kei'i X_{2}' is not generally equivalent to 'X_{2} kei'i X_{1}'; in other words, the operator is not commutative. If unary (meaning that X_{1} is not explicitly specified in a hypothetical expression "X_{1\setminusX}"), then X_{1} is taken to be some universal set O in/of the discourse (of which all other mentioned or relevantly formable sets are subsets, at the least); in this latter case, the word operates as the set (absolute) complement of the explicitly mentioned set here designated as X_{2} for clarity (id est: the output is O\setminusX_{2}=X_{2^C}, where "^{C}" denotes the set absolute complement; in other words, it is the set of all elements which may be under consideration such that they are not elements of the explicitly specified set). When binary with both X_{1} and X_{2} explicitly specified, this word/operator is the set relative complement. This word is somewhat analogous to, depending on its arity, logical 'NOT' or 'AND NOT' (just as set intersection is analogous to logical 'AND', set union is analogous to logical '(AND/)OR'
and set symmetric difference is analogous to 'XOR'). The preferred description/name in English is "set (theoretic) exclusion". See also: "kleivmu". For reference: https://en.wikipedia.org/wiki/Complement_(set_theory) .

- dei'i
- non-logical connective: set difference of x
_{1}and x_{2}: x_{1dei'ix}=x_{1\setminusx}=\x\inx_{1:x\notinx} - jo'ei'i
*(exp!)* - nonlogical connective (and mekso operator) - symmetric difference of sets
- mau'au
- mekso: conversion of operator/function to operand
- xa'ei'o
*(exp!)* - binary mekso operator: Let the inputs X
_{1}and X_{2}be sets in the same universal set O; then the result of this operator applied to them is X_{1^c \cup X}, where for any A \subseteq O, A^{c }= O \setminus A. - kleivmu
- x
_{1}(set) is the relative set complement of x_{2}(set) in/from/with respect to/relative to set x_{3}(set; default: the relevant universal set). - vendaia
- x
_{1}(set) is the unique region/part in the Venn diagram of sets x_{2}(set of sets; exhaustive) such that each of its (i.e.: x_{1}'s) members is a member of exactly each of the explicitly-mentioned elements of x_{3}(set of sets; subset of x_{2}; exhaustive) and of no other elements of x_{2}.