Definition of re- in US English:

re-

prefix

  • 1Once more; afresh; anew.

    ‘reaccustom’
    ‘reactivate’
    1. 1.1 With return to a previous state.
      ‘revert’
      ‘restore’
  • 2In return; mutually.

    ‘react’
    ‘resemble’
    1. 2.1 In opposition.
      ‘repel’
      ‘resistance’
  • 3Behind or after.

    ‘relic’
    ‘remain’
    1. 3.1 In a withdrawn state.
      ‘recluse’
      ‘reticent’
    2. 3.2 Back and away; down.
      ‘recede’
      ‘relegation’
  • 4With frequentative or intensive force.

    ‘resound’
    ‘redouble’
  • 5With negative force.

    ‘recant’
    ‘rebuff’

Usage

In modern English, the tendency is for words formed with prefixes such as re- to be unhyphenated: reacquaint, reconsider, reshape. For the sake of clarity, however, hyphenation is sometimes favored when the root word begins with a vowel: re-elect, for instance, may be preferred as a less awkward spelling than reelect. A hyphen is often used when the word formed with the prefix would be identical in form with, but different in meaning and pronunciation from, an already existing word: re-cover (meaning ‘cover again,’ as in we decided to re-cover the dining-room chairs), as opposed to recover (meaning ‘get better in health’)

Origin

From Latin re-, red- ‘again, back’.

Pronunciation

re-

/ri//rē/