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drop-in ‎(not comparable)

  1. provided for short-term use
  2. (manufacturing) fit to substitute some element in a complex system without changes to the existing infrastructure
    We need the ultimate drop-in biofuel to make use of our expensive oil-based infrastructure.
    • 2012, Robert Mendelsohn, Ariel Dinar, Handbook on Climate Change and Agriculture, page 276
      An alternative to cellulosic based second- generation biofuels are drop-in biofuels, that is, fuels such as synthetic gasoline that can be put into fuel tanks and pipelines with no modifications.


drop-in ‎(plural drop-ins)

  1. one who casually drops in.
  2. informal social event