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A location, A, is said to be equidistant from two other locations, B and C, if the distance from A to B is the same as the distance from A to C.

What is the equivalent word to use in the context of time? That is, suppose that the distance from A to B is different from the distance from A to C, but it takes the same amount of time to get from A to B as it does from A to C.

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I've seen equitemporal used in some cases. There is also equal time, though this doesn't meet the single-word constraint. –  Zairja Aug 30 '12 at 16:04

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Both equitemporal (which Zairja mentioned) and isochronal, “... having equal duration” might work. Google shows about 475 times as many web instances of isochronal as of equitemporal (2.4M vs 5K). Also consider isochronous, in its sense “happening at the same time; isochronal”.

Edit: The word that occurred to me immediately upon reading the question is isochronic: “performed in equal times; said of motions and vibrations occurring at the same time and being equal in duration”. Another interesting word is isochron, which (in much the same sense as in isochron dating) means “an imaginary line or a line on a chart connecting points at which an event occurs simultaneously or which represents the same time or time difference”. Another sense (as used in phrase isochronic tones) is “regular beats of a single tone used for brainwave entrainment”, a sense that accounts for the trade name Isochron for vasodilator drug isosorbide dinitrate.

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Isochronal is a fine, but obscure word. The term temporal is also a fine word, but probably not in widespread use in daily speech, and equitemporal would require most readers or hearers to struggle a bit with the meaning (perhaps, at the same time?). Maybe we need a neologism such as equidurational. Not common or simple, but probably clear. –  bib Aug 30 '12 at 18:30
    
@bib, I should have mentioned isochronic, which might be less obscure than isochronal. See edit –  jwpat7 Aug 30 '12 at 19:27
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OF COURSE! I had forgotten how many times I had already used isochronic this month!!! Probably an equiincidental number of times as I used it last month. –  bib Aug 30 '12 at 19:39

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