False Labor
I think you may be referring to what are called "Braxton-Hicks" contractions.
Braxton Hicks contractions come from a Doctor named John Braxton Hicks. He was the first doctor to ever describe what these type of contractions were. This was back in the mid-late 1800s.
Braxton Hicks
Labor contractions are painful and you can't ignore them. If they are not painful then they are just Braxton Hicks.
only in the last trimester when they prepare the uterus for labor and are called Braxton Hicks contractions.
Nope. Only some do. The lucky ones don't. The Braxton Hicks is just the preparation contractions. Letting you know that your baby is almost ready. They contractions come usually after 6 months. My doctor said there not supposed to hurt, but mines did. I thought I was in labor and I went to the doctor and my doctor sent me home saying that they are just Braxton Hicks and there nothing to be worried about.
It could be contractions or it could be false contractions (Braxton Hicks)
Practice contractions. The tightening of your stomach muscles and uterus preparing you for active labor
No it wont dilate the cervix because it is not true labor.
Sometimes they can lead to some cervical change (including dilation, softening of the cervix, etc.). This is why it's important to call your care provider if you are having lots of Braxton Hicks contractions before you reach "full term" (or 37 weeks). On the other hand, even if your Braxton Hicks contractions are dilating your cervix, they might still be helping to rotate your baby into an optimal position for labor or even toning your uterus in preparation for labor. So even the contractions that aren't "real labor" are still doing something!
The eponym for those contractions is Braxton-Hicks.
No, braxton hicks just help your uterus prepare but it does not mean you are close to delivery trust me I have been there too sweetie.