trimester

Noun
  1. A period of three months;
    Especially one of the three three-month periods into which human pregnancy is divided (synset 115251528)
    is a type of: period, period of time, time period - an amount of time
    subtypes:
    • first trimester - time period extending from the first day of the last menstrual period through 12 weeks of gestation
    • second trimester - time period extending from the 13th to the 27th week of gestation
    • third trimester - time period extending from the 28th week of gestation until delivery
    is a part of: gestation, gestation period - the period during which an embryo develops (about 266 days in humans)
  2. One of three divisions of an academic year (synset 115250725)
    is a type of: academic session, academic term, school term, session - the time during which a school holds classes
    is a part of: academic year, school year - the period of time each year when the school is open and people are studying

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