• Webster's Revised Unabridged Dictionary
    • a Tautochronous (Math) Occupying the same time; pertaining to, or having the properties of, a tautochrone.
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Century Dictionary and Cyclopedia
    • tautochronous Pertaining to or of the nature of a tautochrone; isochronous.
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Chambers's Twentieth Century Dictionary
    • adj Tautochronous taw-tok′rō-nus isochronous
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In literature:

The mechanical properties of the cycloid were investigated by Christiaan Huygens, who proved the curve to be tautochronous.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8" by Various