Portuguese fronteira

← Catalan frontera (cognate)

← Spanish - (cognate)

← French frontière (cognate)

← Italian frontiera (cognate)

← Portuguese fronte (suffix)

← Portuguese eira (suffix)

← Old Portuguese fronteira (inherited)

→ Catalan frontera (cognate)

→ Spanish frontera (cognate)

→ French frontière (mention)

→ Portuguese Fronteira (mention)