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Openbillopencast
opencast mining
opencut
OpenDoc
opened
Opener
OpenGL
openhanded
openhandedness
OpenHCI
openhearted
Opening
Opening a judgment
opening line
opening move
-- opening night --
OpenInsight
Openly
openmouthed
Openness
openside plane
OpenStep
OpenTransport
OpenVMS
OpenWindows
Openwork
opepe
Opera
opera bouffe
Opera box
Opera buffa
opera cloak
opening night
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| Noun | 1. |  opening night - the first performance (as of a theatrical production); "the opening received good critical reviews"Synonyms: curtain raising, opening |