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The most condensed and constricted region of a chromosome, to which the spindle fiber is attached during mitosis.


Down syndrome, a congenital disorder caused by the presence of an extra twenty-first chromosome, can result from aberrant functioning of the centromere. Discuss.

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Borrowed from Medieval Latin dictionarium, from Latin dictionarius, from dictio (speaking), from dictus, perfect past participle of dīcō (speak) + -arium (room, place).


  • (Received Pronunciation) IPA(key): /ˈdɪkʃ(ə)n(ə)ɹi/
  • (General American, Canada) enPR: dĭk'shə-nĕr-ē, IPA(key): /ˈdɪkʃənɛɹi/
  • Hyphenation: dic‧tion‧ary


dictionary (plural dictionaries)

  1. A reference work with a list of words from one or more languages, normally ordered alphabetically, explaining each word's meaning, and sometimes containing information on its etymology, pronunciation, usage, translations, and other data.
    Synonym: wordbook
  2. (by extension) Any work that has a list of material organized alphabetically; e.g., biographical dictionary, encyclopedic dictionary.
  3. (computing) An associative array, a data structure where each value is referenced by a particular key, analogous to words and definitions in a physical dictionary.


For more, see Thesaurus:dictionary

Derived terms

Related terms

  • diction


See also

  • lexicon
  • encyclopedia
  • vocabulary


dictionary (third-person singular simple present dictionaries, present participle dictionarying, simple past and past participle dictionaried)

  1. (transitive) To look up in a dictionary.
  2. (transitive) To add to a dictionary.
  3. (intransitive, rare) To compile a dictionary.
  4. (intransitive) To appear in a dictionary.

Further reading

  • dictionary at OneLook Dictionary Search


  • indicatory
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