isochronicadj.

1780 T. A. Mann in Philos. Trans. 1779 (Royal Soc.) 69 583 This curve is what is called the Horizontal Isochronic.

1881 F. Galton in Proc. Royal Geogr. Soc. III. 657 By ‘isochronic’ passage-charts, I mean charts constructed to show the extreme distances that can be traversed in ‘equal times’ from a common starting point.

1881 F. Galton in Proc. Royal Geogr. Soc. III. 658 Isochronic maps might be..constructed for Continental travel or for home excursions.

1948 Antiquity 22 114 The second [map]..covers the Old World and shows the spread of the food-producing economy from five possible independent centres. The date at which food-production first appeared is shown by isochronic lines. These are an ingenious invention which show ‘equal dates’ exactly as contours show equal heights and isobars equal pressure.

1959 L. M. Harrod Librarians' Gloss. (ed. 2) 155 Isochronic map, one which shows possible progress of travel in all directions from a given centre in certain specified time intervals.

1956 H. Whitehall in Kenyon Rev. 18 iii. 418 Unlike such ‘syllable-timed’ languages as Spanish, English is ‘stress-timed’ or isochronic.

1959 PMLA 74 587/1 Mr. Whitehall distinguishes a type of ‘rhythm’ which he calls the isochronic: it ‘depends on equal time lapses between primary stresses’.

1794 G. Adams Lect. Nat. & Exper. Philos. I. ii. 30 The isochronical vibrations of the pendulum.

1827 Westm. Rev. 8 382 He [Anacreon] mixed up Iambic catalectic dimeters..with Trochaic acatalectic dimeters..as if they were isochronical.