U.S. National Library of Medicine
The beginning of true OBSTETRIC LABOR which is characterized by the cyclic uterine contractions of increasing frequency, duration, and strength causing CERVICAL DILATATION to begin (LABOR STAGE, FIRST ).
The numerical value of labor onset in Chaldean Numerology is: 3
The numerical value of labor onset in Pythagorean Numerology is: 4
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"labor onset." Definitions.net. STANDS4 LLC, 2018. Web. 23 Mar. 2018. <https://www.definitions.net/definition/labor onset>.