ar·cane

[ahr-keyn]
adjective
known or understood by very few; mysterious; secret; obscure; esoteric: She knew a lot about Sanskrit grammar and other arcane matters.

Origin:
1540–50; (< Middle French) < Latin arcānus, equivalent to arc(ēre) to shut up, keep (derivative of arca a chest, box) + -ānus -an

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World English Dictionary
arcane (ɑːˈkeɪn) [Click for IPA pronunciation guide]
 
adj
requiring secret knowledge to be understood; mysterious; esoteric
 
[C16: from Latin arcānus secret, hidden, from arcēre to shut up, keep safe]
 
ar'canely
 
adv
 
ar'caneness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Arcane is a GRE word you need to know.
So is gradient. Does it mean:
An extravagant statement or figure of speech not intended to be taken literally, as to wait an eternity.
m riserun m y1 - y2x1 - x2
Etymonline
Word Origin & History

arcane
1540s, from L. arcanus "secret, hidden," from arcere "close up, enclose, contain," from arca "chest, box," from PIE *ark- "to hold, contain, guard" (cf. Gk. arkos "defense," arkein "to ward off;" Arm. argel "obstacle;" Lith. raktas "key," rakinti "to shut, lock").
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The illustrations are a mix of overfamiliar and refreshingly arcane.
He immersed himself in their arcane biology, and he interviewed numerous
  scientists and security experts.
Once you've grasped that idea, one aspect of the mystery of development isn't
  particularly arcane.
Everyone will learn a lot about the arcane art of scrimshaw.
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