nonlexical

/nɑnˈlɛksɪkəl/
adjective
  1. Not relating to words or vocabulary; not part of a language's lexicon.
    • Linguists study both lexical and nonlexical aspects of speech, such as tone and rhythm.
    • In the experiment, participants repeated nonlexical sounds like 'blip' and 'zork'.
    • The child's babbling was mostly nonlexical, consisting of syllables without meaning.
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