What is the word fast in greek or latin?

The word "fast" has different translations depending on the language you are referring to. In Greek, the word for "fast" is ταχύς (tachys), which means "swift" or "quick." In Latin, there are several words that can be used to express the concept of "fast," including celer (celer), which means "swift" or "quick," and velox (velox), which means "swift," "rapid," or "fleeting."