Basque has been in intense contact with the Latin and Romance languages throughout the last two thousand years. Those uninterrupted relationships have inevitably left marks on the lexicon, some evident, others veiled. This article proposes a lexicostatistical approach of Latin and Romance loanwords in Basque. Three types of corpuses are tested: fundamental lexicon, popular speech and literary writing. Even if the loanwords of Latin and Romance origin are dominant in the (theoretical) total lexicon, the native Basque words remain majority in all the samples of language tested here.