Here are the definitions matched with the appropriate words:
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Relying on external means of processing, storing, and retrieving information rather than using our memory. - External cognitive aids
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The movements, facial expressions, positions, and any other type of communication that does not use words. - Nonverbal communication
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An adaptive technology that allows people with paralysis or fine motor problems to operate their device using a mouth controller. - Mouth stick or mouth-operated device
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A specially modified way of interacting with technology according to the particular need of the individual. - Accessible technology or Assistive technology
Make sure to adapt and use these terms based on the specific context, as they can vary slightly. Let me know if you need any more help!