es·o·ter·ic [èss térrik ] adjective
1. restricted to initiates: intended for or understood by only an initiated few
2. abstruse: difficult to understand
3. secret: secret or highly confidential
[Mid-17th century. From Greek esterikos "belonging to an inner circle," from ester "inner," from es "within."]
es·o·ter·i·cal·ly adverb
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