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placeholder

/ˈpleɪsˌhoʊldɚ/ noun

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about placeholder at Wordnik → Where our words come from →

  1. Something used or included temporarily or as a substitute for something that is not known or must remain generic; that which holds, denotes or reserves a place for something to come later.
    This data is a placeholder, so you'll want to include the real numbers as soon as you have them.
  2. A non-editable caption initially displayed in a blank text box to indicate its function.