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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Increasing in steps or by stages.
  2. adj. Electricity Serving to increase voltage: a step-up transformer.
  3. n. An increase in size, amount, or activity.

Century Dictionary and Cyclopedia

  1. n. In electricity, a transformer or other device for increasing the voltage in an electric circuit.
  2. Serving to convert a current of lower voltage into one of higher voltage: said specifically of transformers and allied devices.

Wiktionary

  1. adj. That increases in stages
  2. adj. That increases a voltage

GNU Webster's 1913

  1. adj. Transforming or converting a low-voltage current into one of high voltage.

WordNet 3.0

  1. v. speed up
  2. v. make oneself visible; take action
  3. v. increase in extent or intensity
  4. n. the act of increasing something

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‘step-up’ has been looked up 737 times, and is not a valid Scrabble word.