Usually means: Third in order or level.
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We found 34 dictionaries that define the word tertiary:

General (24 matching dictionaries)
  1. tertiary: Merriam-Webster.com
  2. Tertiary, tertiary, tertiary, the Tertiary: Oxford Learner's Dictionaries
  3. tertiary: American Heritage Dictionary of the English Language
  4. tertiary, the Tertiary: Collins English Dictionary
  5. Tertiary, tertiary: Vocabulary.com
  6. Tertiary, tertiary: Wordnik
  7. tertiary: Cambridge Advanced Learner's Dictionary
  8. Tertiary, tertiary: Wiktionary
  9. Tertiary (chemistry), Tertiary (disambiguation), Tertiary (economic), Tertiary (geology), Tertiary: Wikipedia, the Free Encyclopedia
  10. Tertiary: Online Plain Text English Dictionary
  11. tertiary: Webster's Revised Unabridged, 1913 Edition
  12. Tertiary: Rhymezone
  13. Tertiary: AllWords.com Multi-Lingual Dictionary
  14. tertiary: Webster's 1828 Dictionary
  15. tertiary: Free Dictionary
  16. tertiary: Mnemonic Dictionary
  17. tertiary: Dictionary/thesaurus
  18. tertiary: Dictionary.com
  19. tertiary: Webster's New World College Dictionary, 4th Ed.
  20. tertiary: Online Etymology Dictionary
  21. tertiary: The Wordsmyth English Dictionary-Thesaurus
  22. tertiary: Infoplease Dictionary

Business (1 matching dictionary)
  1. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. Tertiary: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. tertiary: Medical dictionary

Science (5 matching dictionaries)
  1. Archaeology Wordsmith (No longer online)
  2. Bird On! (No longer online)
  3. Tree of Life Glossary (No longer online)
  4. Tertiary: Extragalactic Astronomy
  5. Tertiary: USGS Paleontology Glossary of Terms

Slang (1 matching dictionary)
  1. tertiary: Urban Dictionary

(Note: See tertiaries as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Of third rank or order; subsequent.
adjective:  (chemistry) Possessing some quality in the third degree; especially having been subjected to the substitution of three atoms or radicals.
adjective:  (ornithology) Of quills: growing on the innermost joint of a bird's wing; tertial.
noun:  Any item considered to be of third order.
noun:  A tertiary colour.
noun:  (geology) Something from the Tertiary Period (the former term for the geologic period from 65 million to 2.58 million years ago).
noun:  (ornithology) A tertiary feather; a tertial.
noun:  (military) A large stage in some extremely powerful thermonuclear weapons (resembling a greatly-enlarged secondary) which is compressed by the explosion of the secondary until ignition of nuclear fusion takes place, in much the same manner as the secondary is imploded by the primary, and which can allow for the attainment of yields of many tens or even hundreds of megatons, and likely even greater; not used in modern weapons due to a greater focus on the accurate use of sub-megaton weapons, the tremendous size of weapons incorporating a tertiary, and the lack of targets whose destruction would necessitate the use of a three-stage weapon.
noun:  (Roman Catholicism) A member of a Roman Catholic third order; a layperson who participates in activities similar to those engaged in by men and women who take religious vows (respectively the first and second orders), and who may wear some elements of an order's habit such as a scapular.
adjective:  (geology) Of or pertaining to the first part of the Cenozoic era when modern flora and mammals appeared.
noun:  (geology) The first part of the Cenozoic era when modern flora and mammals appeared.

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