Stages of Pregnancy Slideshow Early Pregnancy Symptoms Slideshow Pictures Early Pregnancy Symptoms Quiz Dilation: The process of enlargement, stretching, or expansion. The word "dilatation" means the same thing. Both come from the Latin "dilatare" meaning "to enlarge or expand." From Pregnancy and Parenting Resources How to Avoid UTIs During PregnancyYour Best Days to ConceivePregnancy Week by Week Featured Centers When Prostate Cancer SpreadsEssential Tips to Manage DiabetesWhat Is Cystic Fibrosis? What Causes It? Health Solutions From Our Sponsors Kept Your Wisdom Teeth? Therapy at Home?