What does the root word cen mean?

The root word "cen" doesn't have a common, independent meaning. It usually appears as part of a larger word, often in combination with other prefixes or suffixes.

Here are some examples of words containing "cen" and their meanings:

* Centennial: Relating to a period of 100 years.

* Centenary: The 100th anniversary of something.

* Centimeter: A unit of length equal to one hundredth of a meter.

* Centipede: An arthropod with many legs.

* Percent: Out of one hundred.

As you can see, "cen" in these words often refers to a hundred.

If you provide the full word you're interested in, I can give you a more specific explanation of its meaning.