1 CM Cervix Dilation

When we saw my wife's Ob-Gyne, and the IE was done, she was told that the dilation of her cervix was 1CM already.

I don't understand these things, so I searched the internet and found these articles which are good to read.

Best articles to read:

1. Ask Dramy
2. Wikipedia entry
3. Birthing with Genuinever - 1
4. Brithing with Genuinever - 2