What is the X in X-mas?
1520s (originally figurative), from pregnant (adj.1) + -cy. Literal use attested from 1590s.
pregnancy preg·nan·cy (prěg'nən-sē)n.
The condition of a woman or female mammal from conception until birth; the condition of being pregnant.
The period during which a woman or female mammal is pregnant. Also called cyesis.
The condition of carrying developing offspring within the body.
The time period during which this condition exists; gestation.