Usually means: First or most significant in order.
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We found 47 dictionaries that define the word primary:

General (26 matching dictionaries)
  1. primary: Longman Dictionary of Contemporary English
  2. primary: Merriam-Webster
  3. Primary, primary, the Primary: Oxford Learner's Dictionaries
  4. primary: American Heritage Dictionary of the English Language
  5. primary: Collins English Dictionary
  6. primary: Wiktionary
  7. primary: Webster's New World College Dictionary, 4th Ed.
  8. primary: The Wordsmyth English Dictionary-Thesaurus
  9. primary: Infoplease Dictionary
  10. primary: Dictionary.com
  11. primary: Online Etymology Dictionary
  12. primary: Cambridge Essential American English Dictionary
  13. Primary (LDS Church), Primary (astronomy), Primary (band), Primary (chemistry), Primary (disambiguation), Primary (election), Primary (film), Primary (musician), Primary (song), Primary: Wikipedia, the Free Encyclopedia
  14. Primary: Online Plain Text English Dictionary
  15. primary: Webster's Revised Unabridged, 1913 Edition
  16. primary: Rhymezone
  17. primary: AllWords.com Multi-Lingual Dictionary
  18. primary: Webster's 1828 Dictionary
  19. primary: FreeDictionary.org
  20. primary: Mnemonic Dictionary
  21. primary, the Primary: TheFreeDictionary.com
  22. Primary, primary: Wordnik
  23. primary: Cambridge Advanced Learner's Dictionary
  24. primary: Vocabulary.com

Business (5 matching dictionaries)
  1. primary: Merriam-Webster Legal Dictionary
  2. Glossary of Legal Terms (No longer online)
  3. Bouvier's Law Dictionary 1856 Edition (No longer online)
  4. primary, the Primary: Legal dictionary
  5. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. primary, the Primary: Encyclopedia

Medicine (7 matching dictionaries)
  1. primary: Merriam-Webster Medical Dictionary
  2. Primary: MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. Hepatitis C Information Central (No longer online)
  5. primary: Prostate Cancer Interactive Glossary
  6. primary, the Primary: Medical dictionary
  7. Primary: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)
  1. Navajo Code Talkers' Dictionary (No longer online)

Science (4 matching dictionaries)
  1. Bird On! (No longer online)
  2. Primary: Eric Weisstein's World of Mathematics
  3. -primary, primary: PlanetMath Encyclopedia
  4. PRIMARY: Zoom Astronomy Glossary

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

Tech (2 matching dictionaries)
  1. primary: Electronics
  2. AUTOMOTIVE TERMS (No longer online)

(Note: See primaries as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  First or earliest in a group or series.
adjective:  Main; principal; chief; placed ahead of others.
adjective:  (geology) Earliest formed; fundamental.
adjective:  (chemistry) Illustrating, possessing, or characterized by, some quality or property in the first degree; having undergone the first stage of substitution or replacement.
adjective:  (medicine) Relating to the place where a disorder or disease started to occur.
adjective:  (medicine) Relating to day-to-day care provided by health professionals such as nurses, general practitioners, dentists etc.
noun:  (political science) A primary election; a preliminary election to select a political candidate of a political party, or the first round of a two-round election.
noun:  The first year of grade school.
noun:  A base or fundamental component; something that is irreducible.
noun:  The most massive component of a gravitationally bound system, such as a planet in relation to its satellites.
noun:  A primary school.
noun:  (ornithology) Any flight feather attached to the manus (hand) of a bird.
noun:  A primary colour.
noun:  (military) The first stage of a thermonuclear weapon, which sets off a fission explosion to help trigger a fusion reaction in the weapon's secondary stage.
noun:  (aviation) A radar return from an aircraft (or other object) produced solely by the reflection of the radar beam from the aircraft's skin, without additional information from the aircraft's transponder.
noun:  (medicine) The primary site of a disease; the original location or source of the disease.
noun:  (electronics) A directly driven inductive coil, as in a transformer or induction motor that is magnetically coupled to a secondary.
verb:  (US, politics, transitive, intransitive) To challenge (an incumbent sitting politician) for their political party's nomination to run for re-election, through running a challenger campaign in a primary election, especially one that is more ideologically extreme.
verb:  (US, intransitive, transitive) To take part in a primary election.

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