Here are some examples:
* decade: a period of ten years
* decimal: relating to or based on the number ten
* decimeter: one-tenth of a meter
* deciliter: one-tenth of a liter
However, it's important to note that "dec" can also have other meanings in certain contexts, such as:
* decathlon: a sporting event consisting of ten track and field events
* December: the twelfth month of the year
In these cases, the meaning of "dec" is not related to ten.