To remove or displace a hyphen from.
Example: "The dictionary chose to unhyphenate "cry-baby", and listed it as "crybaby"."
Lacking a hyphen.
Example: "The word cooperation is unhyphenated, though some also spell it as co-operation."
Of people, belonging to a single ethnicity or nationality: names for multi-ethnic/multi-nationality groups generally require a hyphen to connect the names being combined.