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How should one go about abbreviating (a)synchronous? Is the most correct form (a)sync. or (a)synch.?

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    Hello User. In my opinion this is easily answerable looking at the dictionary. I couldn't find "async", but "sync" is in every dictionary; Same goes for "synch" more or less, so I suppose it's up to you about which one to use.
    – Alenanno
    Aug 28 '11 at 12:12
  • See related past tense of synchronize and which is correct synced or synched.
    – Kit Z. Fox
    Aug 28 '11 at 15:06
  • Both abbreviated forms are used. It kinda depends on which computer or computer language you worked with first.
    – Hot Licks
    Sep 21 '16 at 0:19
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The common and my preferred way of abbreviating synchronous is sync, rather than synch, partly because it makes more sense to pronounce it as sink than sinch and the shorter abbreviation is simpler and clearer. Also to avoid any confusion with the slang word cinch (pronounced like sinch).

For similar reasons and consistency, I'd recommend async over asynch.

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  • As a bonus, it's also one letter shorter! Aug 28 '11 at 13:12
  • Yes! Save time, ink and disk space!
    – Hugo
    Aug 28 '11 at 14:36
  • Why do you say "cinch" is slang? Sep 15 '16 at 0:23
  • @Azor-Ahai It's an informal term for something that's easy to do.
    – Hugo
    Sep 15 '16 at 7:34
  • @Hugo Oh, I see. It also has non-slang use, a "cinch" sack, which is what I was thinking of. Sep 15 '16 at 17:25
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Ngram for "sync" versus "synch", 1920-2000

The graph for async versus asynch is similar. From this I would say that sync and async are preferred.

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  • The image is broken, please could you fix it?
    – Hugo
    Sep 20 '16 at 7:41

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