Where does “trimestre” come from?
trimestre (Portuguese) comes from Latin trimestris, from Latin mēnsis, from Proto-Italic mēnsis, from Proto-Italic mēns, from Proto-Indo-European mḗh₁n̥s, from Proto-Indo-European meh₁- — to measure.
trimestre (Portuguese): trimester
Ancestry of “trimestre”, step by step