Ubiquitous comes to us from the noun ubiquity, meaning "presence everywhere or in many places simultaneously." Both words are ultimately derived from the Latin word for "everywhere," which is ubique. Ubiquitous, which has often been used with a touch of exaggeration to describe those things that it seems like you can't go a day without encountering, has become a more widespread and popular word than ubiquity. It may not quite be ubiquitous, but if you keep your eyes and ears open, you're apt to encounter the word ubiquitous quite a bit.