For the prefix "deca-" meaning ten:
* Decagram is a unit of mass equal to 10 grams.
* The decagon has ten sides and ten angles.
* She used a decameter stick to measure the length of the garden.
For the word "deca" as short for "decade":
* The 1980s were a deca of great musical innovation.
* He's been living in this city for almost a deca.
For the word "deca" as a slang term for a decade:
* It's been a deca since we last saw each other.
* The music scene has changed a lot in the last deca.
For the word "deca" as a specific term in a particular field (like in "decaffeinated"):
* I prefer to drink deca coffee because it doesn't keep me up at night.
* The deca version of this product tastes just as good as the original.
The meaning of "deca" depends on the context. It's important to understand the word's intended meaning based on the surrounding words and phrases.