The Collaborative International Dictionary of English v.0.48:
Nascency \Nas"cen*cy\ (n[a^]s"sen*s[y^]), n. [L. nascentia. See Nascent.] State of being nascent; birth; beginning; origin. [1913 Webster]WordNet (r) 3.0 (2006):
nascency n 1: the event of being born; "they celebrated the birth of their first child" [syn: birth, nativity, nascency, nascence] [ant: death, decease, expiry]