📖 ReadingGrade 4Lesson 4
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Use Dictionaries and Thesauruses

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Learning Objectives

  • 1Locate and read a dictionary entry to find a word's meaning and word class
  • 2Use a thesaurus to find synonyms that improve writing
  • 3Choose the most appropriate synonym for a given context
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Mini Lesson

A dictionary and a thesaurus are two essential reference tools. Knowing how to use them well makes you a stronger reader and writer.

Using a Dictionary

  • Entries are in alphabetical order.
  • Each entry shows: the word, its pronunciation (often in brackets), its word class (noun, verb, adjective...), and its definition.
  • Many entries include an example sentence.
  • Some words have multiple numbered definitions — read all of them to find the one that matches your context.

Reading a Dictionary Entry

Sample Entry

transport (trans·port) verb 1. To carry people or goods from one place to another. "Trucks transport food to supermarkets." 2. To cause someone to feel as if they are in another place or time.

Using a Thesaurus

  • A thesaurus lists synonyms — words with similar meanings.
  • Look up a word and you get a list of alternatives.
  • Always check that the synonym fits the sentence — synonyms are similar but not always identical in meaning.
  • Using a thesaurus helps you avoid repeating the same word.
Parts of a Dictionary EntryParts of a Dictionary EntryHeadwordThe word being definedPronunciationHow to say the wordWord classnoun, verb, adj...DefinitionWhat the word means
Dictionary vs ThesaurusDictionary vs ThesaurusDICTIONARYFind what a wordmeansword classpronunciationexample sentenceTHESAURUSFind alternativewords (synonyms)improve writingavoid repetitionvary vocabulary
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Not all synonyms are interchangeable. "Happy" and "ecstatic" are both positive, but "ecstatic" is much stronger. Always read the sentence again after swapping a word.

Vocabulary
dictionary
A book or tool that lists words and their meanings.e.g. Use the dictionary to look up unfamiliar words.
thesaurus
A book or tool that lists synonyms and antonyms.e.g. A thesaurus suggests "happy" alternatives like joyful or cheerful.
entry
A single word and its information in a dictionary.e.g. The entry for "clear" lists three meanings.
synonym
A word that means the same or nearly the same as another.e.g. "Big" and "large" are synonyms.
antonym
A word that means the opposite of another.e.g. "Hot" and "cold" are antonyms.
word class
A group that a word belongs to (noun, verb, adjective, adverb).e.g. "Run" is a verb; "dog" is a noun.
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