ob·ver·sion 
(ŏb-vûrzhən, əb-)
(ŏb-vûrzhən, əb-)n.
1. The process of obverting or the condition so resulting.
2. Logic Inference of the obverse of a proposition.
- sure thing
- surety
- surety bond
- suretyship
- surf
- surface
- surface-active
- surface dive
- surface diver
- surface diving
- surface-effect ship
- surface mail
- surface of revolution
- surface plate
- surface structure
- surface tension
- surface-to-air missile
- surface-to-surface missile
- surface wave
- surfactant
- surf and turf
- surfbird
- surfboard
- surfboarder
- surfboarding