deca-deca- /dekə/ prefix [in nouns] 
ten: 
a decalitre (=10 litres) the decathlon (=a sports competition with 10 different events) → deci-
ten: a decalitre (=10 litres) the decathlon (=a sports competition with 10 different events) → deci-- autobiographical
- autobiography
- autocracy
- autocrat
- autocratic
- autocratically
- Autocue
- autodialler
- autogas
- autograph
- autograph driving
- auto-immune disease
- automagically
- automaker
- automate
- automated
- automatic
- automatically
- automatic pilot
- automatic transmission
- automation
- automaton
- automobile
- automotive
- autonomous