it means they will accept a land contract for the sale. It means that an offer has been accepted. You can still make a secondary offer on the home but it will not be presented to the seller until and unless the first contract falls through, at least in the US.
A premature birth is a birth that takes place more than three weeks before the baby is due. In other words, a premature birth is one that occurs before the start of the 37th week of pregnancy. Normally, a pregnancy usually lasts about 40 weeks. Premature birth gives the baby less time to develop in the womb. Premature babies, especially those born earliest, often have complicated medical problems.
The World Health Organization (WHO) defines prematurity as babies born before 37 weeks from the first day of the last menstrual period. Recent data indicate that >1 in 10 babies born around the world in 2010 were premature and this translates to an estimated 15 million preterm births. In England and Wales in 2005, there were 11,657 infants born at less than 33 weeks of gestation, more than 90% of whom survived the immediate postpartum period.