You can say it has, but really it is the labour stage that has them. Dilation happens during the first stage of labour, which has 3 phases:
1. The early labour phase, which begins with the first real contractions and ends when the cervix reaches the 3 cms. of dilation,
2. The active labour phase, in which the contractions get more intense, continues the dilation from 3 to 7 cms.
3. The transition phase, which goes from 7 to 10 cms. of dilation. Obviously, this can vary from woman to woman.