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in the PONS Dictionary

fron·tier [frʌnˈtɪəʳ, Am -ˈtɪr] N

1. frontier (boundary):

frontier
Grenze f <-, -n>
internal frontier

2. frontier esp Am (outlying areas):

the frontier

3. frontier (of knowledge):

frontier
Neuland nt <-(e)s> kein pl

cross-ˈfrontier ADJ

cross-frontier trade:

ˈfron·tier sta·tion N

frontier station

frontier spirit

frontier spirit

customs frontier N handel

customs frontier

production frontier N CTRL

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