Trimester
WordNet
noun
(1) One of three divisions of an academic year
(2) A period of three months; especially one of the three three-month periods into which human pregnancy is divided
WiktionaryText
Etymology
From from +
Noun
- A period of three months or about three months.
- She is in the second trimester of her first pregnancy.
- One of the terms of an academic year in those learning institutions that divide their teaching in three roughly equal terms, each about three months long. Compare semester.
- The school operates on a trimester schedule.