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According to Wikipedia, the past tense (and past participle) of the verb to output is either output or outputted. Are these two forms entirely interchangeable? Or do they have certain nuance in meaning or context (e.g. in programming one of the forms is preferred)?

Instead of correct results, my program output/outputted garbage.

Which one should I choose? My logical sense tells me output is better because it derives from put, but intuitively I tend to use outputted when I speak and don't have time to think.

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Possible duplicate of Inputted or input? – RegDwigнt Jul 24 '11 at 11:01
Wait. Isn't outputting something you do in golf? – GEdgar Jul 24 '11 at 13:18
I've always used 'output' myself. – Kye Jul 24 '11 at 14:06
Instead of correct results, my program produced garbage. – mkennedy Jul 24 '11 at 16:34
up vote 16 down vote accepted

Dictionary.com endorses either output or outputted. Ngrams and a Google search (238K vs. 22K) yield evidence of a definite preference for output. (Note: it output instead of was output yields similar results)

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The word "output" is a noun, not a verb. I believe "outputting" is just an illiterate form of "to put out" or "to produce as output".

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Please name a general-purpose English language dictionary that does not include an entry for output as a verb. – phenry Mar 25 '15 at 20:48

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