General meaning: ten
* Decade: a period of ten years
* Decalogue: the Ten Commandments
* Decameter: a unit of length equal to ten meters
* Decathlon: an athletic contest with ten events
* Decagram: a unit of mass equal to ten grams
* Decaliter: a unit of volume equal to ten liters
* Decapod: an animal with ten legs (e.g., crabs, lobsters)
* Decapitate: to behead
* Decadence: a state of decline or moral deterioration
* Decadent: characterized by decadence
Less common words:
* Decadent: a person who indulges in luxury and pleasure
* Decalogue: a set of ten rules or principles
* Decameter: a metric unit of length (10 meters)
* Decagram: a metric unit of mass (10 grams)
* Decaliter: a metric unit of volume (10 liters)
* Decametric: relating to a decameter
* Decapolis: a group of ten cities in ancient Palestine
* Decasyllabic: consisting of ten syllables
* Decasyllable: a word or line of poetry with ten syllables
Note: Some words like "decadent" can also be used as adjectives, meaning "characterized by decadence."