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null (adj.)

"void of legal force, invalid," 1560s, from French nul, from Latin nullus "not any, none," from ne- "not, no" (from PIE root *ne- "not") + illus "any," diminutive of unus "one" (from PIE root *oi-no- "one, unique").

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Definitions of null from WordNet
1
null (n.)
a quantity of no importance;
Synonyms: nothing / nil / nix / nada / aught / cipher / cypher / goose egg / naught / zero / zilch / zip / zippo
2
null (adj.)
lacking any legal or binding force;
null and void
Synonyms: void
From wordnet.princeton.edu