Usually means: Points defining ellipse or hyperbola.
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We found 27 dictionaries that define the word foci:

General (16 matching dictionaries)
  1. foci: Merriam-Webster
  2. foci: Oxford Learner's Dictionaries
  3. foci: American Heritage Dictionary of the English Language
  4. foci: Collins English Dictionary
  5. foci: Vocabulary.com
  6. Foci, foci: Wordnik
  7. foci: Cambridge Advanced Learner's Dictionary
  8. foci: Wiktionary
  9. foci: Infoplease Dictionary
  10. FOCI: Dictionary.com
  11. foci: Cambridge Essential American English Dictionary
  12. Foci: Online Plain Text English Dictionary
  13. Foci: AllWords.com Multi-Lingual Dictionary
  14. FOCI, foci: Stammtisch Beau Fleuve Acronyms
  15. foci: FreeDictionary.org
  16. foci: TheFreeDictionary.com

Business (1 matching dictionary)
  1. foci: Legal dictionary

Computing (1 matching dictionary)
  1. foci: Encyclopedia

Medicine (4 matching dictionaries)
  1. foci: Merriam-Webster Medical Dictionary
  2. ABTA Brain Tumor Patients (No longer online)
  3. online medical dictionary (No longer online)
  4. foci: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. FOCI: Acronym Finder
  2. AbbreviationZ (No longer online)
  3. foci: Idioms

Science (1 matching dictionary)
  1. foci, foci: PlanetMath Encyclopedia

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

(Note: See focus as well.)

Definitions from Wiktionary (focus)

noun:  (countable, optics) A point at which reflected or refracted rays of light converge.
noun:  (countable, geometry) A point of a conic at which rays reflected from a curve or surface converge.
noun:  (uncountable, photography, cinematography) The fact of the convergence of light on the photographic medium.
noun:  (uncountable, photography, cinematography) The quality of the convergence of light on the photographic medium.
noun:  (uncountable) Concentration of attention.
noun:  (countable) Something to which activity, attention or interest is primarily directed.
noun:  (countable, seismology) The exact point of where an earthquake occurs, in three dimensions (underneath the epicentre).
noun:  (graphical user interface) The status of being the currently active element in a user interface, often indicated by a visual highlight.
noun:  (linguistics) The most important word or phrase in a sentence or passage, or the one that imparts information.
noun:  An object used in casting a magic spell.
noun:  (ichthyology) The centre of an older fish's scale, which is the point where a younger fish's scale starts to grow from.
verb:  (transitive) To cause (rays of light, etc) to converge at a single point.
verb:  (transitive, optics) To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
verb:  (intransitive, optics, of a lens, optical instrument, etc.) To adjust itself or be adjusted such that light from a scene converges appropriately to create a clear image.
verb:  (transitive) To direct attention, effort, or energy to a particular audience or task.
verb:  (intransitive) To concentrate one’s attention.
verb:  (intransitive, followed by on or upon) To concentrate one's attention on something; to have as one's central point of interest, concern, etc.
verb:  (computing, graphical user interface, transitive) To transfer the input focus to (a visual element), so that it receives subsequent input.
verb:  (accounting, formerly) To aggregate figures of accounts.
▸ Also see focus


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