— trimestral /truy mes"treuhl/ , trimestrial , adj.
/truy mes"teuhr, truy"mes-/ , n.
1. a term or period of three months.
2. one of the three approximately equal terms into which the year is divided by some colleges, schools, etc.
[ 1815-25; trimestre trime ( n ) stris of three months, equiv. to tri- TRI- + -me ( n ) stris (see SEMESTER) ]