intro-intro- /ɪntrə/ prefix 
into, especially into the inside: 
introspection (=examining your own feelings)
into, especially into the inside: introspection (=examining your own feelings)- opening hours
- opening night
- opening time
- opening up
- open-jaw fare
- open letter
- openly
- open market
- open marriage
- open mike
- open-minded
- open-mindedness
- open-mouthed
- open-necked
- openness
- open-plan
- open primary
- open prison
- open sandwich
- open season
- open sesame
- open source
- open system
- open-toed
- Open University