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Adverb: esoterically  ,e-su'te-ri-k(u-)lee [N. Amer], ,ee-su'te-ri-k(u-)lee or ,e-su'te-ri-k(u-)lee [Brit]
  1. In a way that is likely to be understood by only a small number of people with specialized knowledge
    "He spoke esoterically about quantum mechanics"