NCIt definition : One of the 12 divisions of a year as determined by a calendar. It corresponds to the
unit of time of approximately to one cycle of the moon's phases, about 30 days or
4 weeks.;
Alternative definition : CDISC: One of the 12 divisions of a year as determined by a calendar. It corresponds
to the unit of time of approximately to one cycle of the moon's phases, about 30 days
or 4 weeks. (NCI);