One of three periods in which the pregnancy is divided. Each trimester lasts approximately three months. The first trimester lasts from the first day of the last menstrual period to the end of the thirteenth week. It embraces the embryonic stage of development. The second trimester lasts from week fourteen to week twenty six and marks the period of rapid fetal growth. The third trimester lasts from the twenty eighth week through to delivery.

Literally, a three-month period of time; so the nine months of pregnancy are divided into the first, second and third trimesters. Most miscarriages take place in the first trimester (up to 12 or 13 weeks). Pregnancies that reach the third trimester (beyond 27 weeks) have an increasingly good chance of being viable (though nowadays, with intensive care, survival has occurred from about 24 weeks).

A calendar system used by some colleges that is made up of three 10-12 week periods.

one of three periods lasting about 3 months each; the stages into which pregnancy is divided

Pregnancy is divided into three trimesters: weeks 0-12 when your baby's major organs are developing; weeks 12-28, when your baby grows and his organs mature; and weeks 29-40, when your baby continues to develop and gain weight before he is born.

A third of a pregnancy. Trimesters divide pregnancy into three 13-week periods. The development and potential problems of pregnancy and the foetus vary by trimester. Ultrasound Scan In ultrasound procedures, high-frequency sound waves are used to create a moving image on a screen. Ultrasound images can be used to diagnose infertility and other medical problems.

An academic calendar period of about 15 weeks. Three trimesters make up one year. See Semester System and Quarter System.

Period of study of approximately 16 weeks in an academic year that is divided into three equal terms.

one of three divisions of an academic year

A few universities in Canada operate on a formal trimester system, with three terms of equal length and admission to any of the three terms.

A term of three months in the prenatal gestation period: first trimester=0-13 weeks (0-93 days); second trimester=14-26 weeks (94-187 days); and third trimester =27+ weeks (188+ days).

A term consisting of one third of an academic year. A school on the trimester system has three equal trimesters each year.

a system run by a few Canadian universities in which the academic year is divided into three terms of equal length.

A division of the academic year into thirds, adding a summer term to the fall and spring terms.

The nine calendar months of gestation is divided into 3-month periods called trimesters.

A period of one-third of the total. Pregnancy is divided into three trimesters. The first trimester is 0-13 weeks of gestation. The second trimester is 14-26 weeks of gestation. The third trimester is 27 weeks gestation until birth.

pregnancy is divided into three trimesters or terms. the first ends at 14 weeks' gestation, the second ends at 28 weeks' gestation, and the third ends with delivery.

One of the three periods of pregnancy, each lasting about 3 months.

A period lasting nominally 3 months. A human pregnancy is often divided into three trimesters, from fertilization to birth. U.S. Laws restricting abortions often differ among the trimesters. Canada has no laws regulating abortions.

The nine months of pregnancy is traditionally divided into three trimesters: distinct periods of roughly three months in which different phases of fetal development take place. See the entire definition of Trimester

First, second or third period of three months  of a pregnancy.

A period of three months. The period of gestation is divided into three units of three calendar months each. Some important obstetrical events may be conveniently categorized bytrimesters.

A stage or period of three months duration during pregnancy.

a 3-month period; usually used to refer to one-third of the length of a normal human pregnancy.

A period of three months. Also one of the three parts or stages of pregnancy, each approximately three months long.

A trimester is a period of three months. Pregnancy consists of three trimesters.

Any period of three months during pregnancy.

The amount of time that pregnancy is broken down into. There are three trimesters in a pregnancy, each being three months.

one of three divisions of the academic year, also known as a session.

Period of study consisting of approximately three equal terms of 16 weeks during the academic year.

a period or term of three calendar months (13 weeks).

One of the 3-month periods into which pregnancy is divided. The first trimester is 0–13 weeks of gestation, the second trimester is 14–26 weeks of gestation and the third trimester is 27 weeks of gestation until birth.

Calendar system used primarily by the state's technical branches. Classes and grade reports are divided into three periods, each lasting about 10 weeks.

A normal hu7man pregnancy is 9 months. A trimester is a period of three months; hence, 1st, 2nd, and 3rd trimesters.

A time span of three months. Pregnancy is divided into three trimesters, each approximately 13 to 14 weeks long. Generally speaking, each trimester is marked by different phases of fetal development.

period of 3 months.

a period of three months; pregnancy is usually broken into three trimesters.

a period of three months. A 9-month pregnancy is divided into first, second, and third trimesters.

an academic term representing one-third of an academic year

A term used to define a period of three months. In pregnancy, the first trimester is 1-12 weeks; the second trimester is 13-26 weeks, and the third or last trimester is 27- delivery.

Period of study that usually covers three equal terms of 16 weeks during an academic year.

The standard period of teaching and assessment for courses at Victoria, usually of 12 to 13 weeks. The year is divided into three trimesters, the first from March to June, the second from July to October, and the third from November to February. The third trimester is also referred to as the summer trimester. [1+2/3] denotes a course taught over the first two trimesters, [1/3] the first trimester, [2/3] the second and [3/3] the third.

One-third of the length of a pregnancy (3 months).

one of three periods during a pregnancy. Pregnancy is unequally divided into three trimesters. The first trimester goes from conception up to 14 weeks, the second trimester from 14-28 weeks and the third trimester from 28 weeks to delivery.

Each three-month period during the nine months of pregnancy.

A period of pregnancy lasting roughly three months, with pregnancy being divided into three trimesters.

Any of the three 3-month periods into which pregnancy is divided.

One of the three periods of pregnancy is a trimester. Each period or stage lasts about three months.

Three months of a pregnancy, usually expressed as first, second, or third trimester.

An academic calendar period of about 15 weeks. Three trimesters make up one year. Students normally progress by attending two of the trimesters each year and in some colleges can accelerate their programs by attending all three trimesters in one or more years.

a pregnancy is divided into phases, which are about three months each.