1. noun /ˈdɛm.əʊ/
After hearing the demo the record label approved funding to record the song with a full band.
b) a recording of a song meant to demonstrate its overall sound for the purpose of getting it published or recorded more fully
2. verb /ˈdɛm.əʊ/
The band demoed thirty songs. Their manager thought that ten of the songs would make a good record.
Wikipedia foundation.