3. Using “over” instead of “more than” to indicate greater numerical value: Here’s the rule that you may have been taught at some point: if you are talking about a quantity of something, then you should use “more than” to describe a greater amount, e.g. “The stables housed more than a thousand horses.” But if you are discussing spatial dimensions, then you should use “over” to discuss greater dimensions, e.g. “The mountain was over 20,000 feet tall.” But perhaps the final the death knell of this distinction sounded just this year when the Associated Press announced a change to the AP Stylebook: “more than” and “over” are now both acceptable ways to indicate greater numerical value. The AP wasn’t exactly on the forefront of the “more than” versus “over” question; many style books had long ago ditched the rule, including the Chicago Manual of Style.
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