potential barrier

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  - Potawatomi
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  - potent
  - potentate
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  - potential barrier
  - potential difference
  - potential energy
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Concise Oxford English Dictionary © 2008 Oxford University Press:
potential barrier

▶noun Physics a region within a force field in which the potential is significantly higher than at points either side of it, so that a particle requires energy to pass through it.

'potential barrier' also found in these Oxford entries:

tunnel

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potential barrier