multigravida: a woman who has had two or more pregnancies
multipara: a woman who has completed two or more pregnancies to the stage of fetal viability
nulligravida: a woman who has never been pregnant
nullipara: a woman who has not completed a pregnancy with a fetus or fetuses who have reached the stage of fetal viability
parity: the number of pregnancies in which the fetus or fetuses have reached viability when they are born, not the number of fetuses (e.g., twins) born. Whether the fetus is born alive or is stillborn (fetus who shows no signs of life at birth) after viability is reached does not affect parity
postdate or postterm: a pregnancy that goes beyond 42 weeks of gestation
preterm: a pregnancy that has reached 20 weeks of gestation but before completion of 37 weeks of gestation.
primigravida: a woman who is pregnant for the first time
primipara: a woman who has completed one pregnancy with a fetus or fetuses who have reached the stage of fetal viability
term: a pregnancy from the beginning of week 38 of gestation to the end of week 42 of gestation
viability: capacity to live outside the uterus; about 22 to 24 weeks since last menstrual period, or fetal weight greater than 500 g