in camera is an adverb meaning "kept private or confined to those intimately concerned". It carries one recorded sense.
kept private or confined to those intimately concerned
“it was discussed privately between the two men”
“privately, she thought differently”
“some member of his own party hoped privately for his defeat”
“he was questioned in private”
Definitions, synonyms and semantic relations for in camera come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.