from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Located beneath or below; underlying.
  • adj. Lying at a lower level but not directly beneath.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Lying beneath or at a lower level; underlying.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Lying under or below.
  • adj. Being in a lower situation, though not directly beneath.

from The Century Dictionary and Cyclopedia

  • Lying under or below: in geology, applied to rocks, beds, or strata, considered with reference to their position beneath other overlying formations.
  • Being in a lower situation, though not necessarily directly beneath.
  • In algebra, following below the line of the main characters: as, a subjacent letter, as the n in mn.
  • n. In logic, the converting proposition or consequent of a conversion.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lying nearby but lower


Latin subiacēns, subiacent-, present participle of subiacēre, to lie beneath : sub-, sub- + iacēre, to lie; see yē- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin subiaceō ("lie beneath"). (Wiktionary)



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