Meaning of underlie

un•der•lie

Pronunciation: (un"dur-lī'), [key]
— -lay, -lain, -ly•ing.
  1. to lie under or beneath; be situated under.
  2. to be at the basis of; form the foundation of.
  3. to function as the root morpheme or original or basic form of (a derived form): The form “boy” underlies “boyish.”
  4. to be primary to another right or security.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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