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/fʁɔ̃.tjɛʁ/frontière
1.
nounfemininePlur
borders
territorial boundaries
Il y a souvent des contrôles aux frontières pendant les vacances.
There are often border controls during the holidays.
2.
nounfemininePlur
limits
boundaries (figurative)
La science repousse sans cesse les frontières du possible.
Science keeps pushing the boundaries of what is possible.