WordNet sense 1 (the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus):

gestation, pregnancy

WordNet sense 2 (the kinship relation between an offspring and the mother):

motherhood

WordNet sense 3 (the quality of having or showing the tenderness and warmth and affection of or befitting a mother):

motherliness, maternalism, maternal quality