| Term
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Definition
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Example
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See also
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| Abbreviation
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A sequence of words is reduced to their first letters.
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USSR, laser
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Word-formation, acronym, initialism
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| Ablaut
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The inflectional marking of the preterite or other verb tenses is realized through change of the root vowel. Ablaut patterns consitute allomorphs of the regular -ed inflection in English.
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sing, sang, sung
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Allomorph, preterite, root morpheme, tense
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| Accusative case
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Signals the direct object of a transitive verb.
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She kissed her. You wrote a new essay?
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Direct object, transitive verb
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| Acronym
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Abbreviation that can be pronounced as one word.
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NATO, NASA
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Initialism, lexeme, non-additive word-formation
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| Adverb
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A word class that modifies the main verb of a clause in a way that adds context.
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She quickly realized that...
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Circumstance adverb, clause, degree adverb, sentence adverb, word class
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