Definition of "guestimates" [guestimates]

• Plural form of guestimate. (noun)

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• "All we have are "guestimates": not robust calculations from the first principles, as many people believe, but model-based estimates."
• "Such outside "guestimates" would suggest that annual costs might range from £15 million to £25 million—a little short of the estimate made by the noble Lord, Lord Pearson."
• "Hopefully they won't, so according to Shell's guestimates, energy demand is likely to rise by about 64% in the developing world, and by 3% in the already industrialised world."