pregnancy, gestation, maternity -- (the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus)
motherhood, maternity -- (the kinship relation between an offspring and the mother)
motherliness, maternalism, maternal quality, maternity -- (the quality of having or showing the tenderness and warmth and affection of or befitting a mother; "the girl's motherliness made her invaluable in caring for the children")