† ˈfrontieringadj.Obsolete occupying the frontier or border; neighbouring.
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society > inhabiting and dwelling > inhabiting a type of place > [adjective] > dwelling on border
frontieringc1600
c1600 J. DymmokTreat. Ireland (1842) 35 His Lordship..repared the breaches of the castle, and placed such a garrison in the same as might anoy the fronteringe rebells.