un·der·lie

[uhn-der-lahy]
verb (used with object), un·der·lay, un·der·lain, un·der·ly·ing.
1.
to lie under or beneath; be situated under.
2.
to be at the basis of; form the foundation of.
3.
Grammar. to function as the root morpheme or original or basic form of (a derived form): The form “boy” underlies “boyish.”
4.
Finance. to be primary to another right or security.

Origin:
before 900; Middle English underlyen (v.), Old English underlicgan. See under-, lie2

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
underlie (ˌʌndəˈlaɪ) [Click for IPA pronunciation guide]
 
vb , -lies, -lying, -lay, -lain
1.  to lie or be placed under or beneath
2.  to be the foundation, cause, or basis of: careful planning underlies all our decisions
3.  finance to take priority over (another claim, liability, mortgage, etc): a first mortgage underlies a second
4.  to be the root or stem from which (a word) is derived: "happy" underlies "happiest"
 
'underlier
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

underlie
O.E. under licgan "to be subordinate to, to submit to;" see under + lie (v.2). Meaning "to lie under or beneath" is attested from 1600; fig. sense of "to be the basis of" is attested from 1852 (implied in underlying).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Despite the importance of this disorder, surprisingly little is known about
  what brain mechanisms might underlie it.
Fundamental trends in oil demand and supply underlie this emerging consensus.
Reproductive hormones may underlie this susceptibility.
Each prediction has a confidence ranking, which reflects the size and number of
  studies that underlie the calculations.
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