Meanings

punishment without a legal trial

small private school (esp. for cramming)

privately-made (esp. postcard, mailing card, etc.)

private railway

private ownership

private detective

private expense

demesne

I

post office box

private individual

personal affairs

I-novel

selflessness

selfless devotion

whispering

private (non-governmental) school (college, university)

private plan

ordinary clothes (i.e. non-uniform)

public and private matters