a. [TRANS- 3.] Lying, living, or done beyond the frontier of a country.

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1877.  Ld. Lytton, Lett. (1906), II. xv. 481. The rudest and most unmanageable transfrontier chieftains.

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1909.  Daily Chron., 22 Jan., 3/4. A personal history of trans-frontier surveys and boundary demarcations.

3