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I'm looking for a single-word verb that means "to make more accurate".

The OED lists a word that might work, but the context is sort of restricted to an (in my opinion unfairly) small situation set. It lists the word accurize, which is fairly new (its first recorded use by the OED is from 1955), is originally & chiefly a US term, and means, "To adjust or modify (a firearm or (occas.) other device) in order to improve accuracy."

I can't find any other word that means the desired definition.

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    Tune or refine might fit, but what is the context you are referring to? – user66974 Jul 28 '15 at 15:46
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    Though existing usage might have a limited context, accurize has the advantage of being immediately understandable. At worst, it's no worse than marketer-speak. – Kevin Krumwiede Jul 28 '15 at 17:51
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    One can tighten an estimate. – ajd Jul 28 '15 at 20:08
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    Instead of saying, “we need to accurize this data.” we say, “we need to improve the accuracy of this data.” – Jim Jul 28 '15 at 20:41
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    A support tech just included the word 'accurated', used as a verb, in an email to me. I landed here as I tried to find out whether it's a real word, and what it means. ☺ – Michael Scheper Oct 14 '16 at 16:44
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Answers from comments that I completely agree with:

Refine: To improve in accuracy, delicacy, or excellence.

That's pretty much perfect.

Tighten: To make tighter.

With this definition of 'tight', or a similar one:

Tight: Well-rehearsed and accurate in execution.

We often say 'fine-tune' when talking about making something even more accurate, but 'tune' can be used as well, especially if the thing isn't very accurate to begin with.

Tune: To make more precise, intense, or effective; to put into a proper state or disposition.

Definitions from Wiktionary.

17

hone - to perfect or make more intense or effective
(thefreedictionary.com)

From Kiplinger's Personal Finance...

To hone the numbers further, figure out how much income you would need to replace each month if you lost your job


But in practice most people would probably use...

fine-tune - to make fine adjustments to (something) in order to obtain optimum performance
(thefreedictionary.com)

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    You've fine-tuned the format of your answer. How could you write the sources using small letters? – user66974 Jul 28 '15 at 15:53
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    @Josh61: I could (and indeed can and did) just enclose the relevant text within <sub><sup> and </sub></sup>. But that doesn't work in SO comments (which is just as well, or you wouldn't be able to make sense of this one! :) – FumbleFingers Jul 28 '15 at 16:14
  • Lol, freaking beautiful, @FumbleFingers. XD – SarahofGaia Jul 30 '15 at 15:11
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General purpose verbs you could use would be "correct" and "rectify". But we need more context. If you're referring to improving the accuracy of some type of tool or instrument, then 'calibrate' would be the best choice.

  • But does calibrate mean "to make more accurate"? – WS2 Jul 28 '15 at 16:25
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    @WS2: Yes; an uncalibrated scale might read the actual weight of the object plus 5 pounds, After (correctly) calibrating the scale, it would then read the true weight. – Hurkyl Jul 28 '15 at 17:01
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    @Hurkyl: An uncalibrated thermometer might not "read" anything at all (though you could safely assume that the higher up the tube the liquid goes, the hotter it is). So in at least some contexts, "calibration" doesn't necessarily mean make [existing readings] more accurate - it can just mean make a measuring device capable of indicating a "value" (whether "accurate" or not). – FumbleFingers Jul 28 '15 at 17:13
  • Calibration improves the accuracy of uncalibrated systems. Once calibrated, further calibration (ideally) has no effect on a system's accuracy. – talrnu Jul 28 '15 at 18:18
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    Un-calibrated doesn't necessarily give 'garbage', it can be the case, but it can also simply be slightly out of tolerance, therefore giving reliable readings that are just a little out of specification. Calibration isn't binary, there isnt just wrong or right, in some situations 'kind of right' is acceptable. The reading is wrong, but it's 'right enough', but could still benefit from calibration – nickson104 Jul 30 '15 at 15:15

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