Etymology

neither

nei·ther
N1E1I1T1H4E1R1

Today it means: Not one of two; not either; not one or the other. Full definition →

Middle English neiþer ← Old English nāwþer
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The story

  1. Old English · inherited fromnāwþer
  2. Middle English · inherited fromneiþer
  3. English todayneither

Alteration (after either) of nauther, from Middle English neiþer, from Old English nāwþer, contraction of nāhwæþer, corresponding to no + whether. Compare Latin neuter (“neither”). By surface analysis, not + either.

Etymology from Wiktionary, CC BY-SA 4.0.