Labor and delivery are the culmination of approximately 280days of preparation.
Labor is the process by which the viable products of conception (fetus, placenta, cord and membrane ) are expelled from the uterus. (whole process, series of events ,viable fetus)
It is defined as the progress effacement and dilation of the cervix, resulting from rhythmic contraction of the uterine musculature.
preterm labor—prior to 37 completed weeks