Privately, where no one else can see and/or hear what one is doing or saying.(adverb)
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Use "in private" in a sentence
"In faith by hearing the last word rests with the teacher; in private judgment it rests with the reader, who submits the dead text of Scripture to a kind of post-mortem examination and delivers a verdict without appeal: he believes in himself rather than in any higher authority."
"Undoubtedly the Eucharist was at first often kept in private houses, but a Council of Toledo in"
"Sent quite young to Paris, he studied in private boarding-schools, and for some time attended lectures at the Lycée Bonaparte."