à deux
intimate
homely
privately
in petto
have a quiet word
have a word in someone's ear
privy
close-tiled
privateness
private
esoteric
proprietary
in secret
nonprivate
private message
under the rose
secret
personal space
tête-à-tête
by-interest
personal life
prep school
preparatory school
powwow
interiority
turfdom
personalness
inderivatively
in confidence
off-the-record
knowing
chamber
home school
autonomy
self-direction
self-reliance
self-sufficiency
offline
autocephalous
externalistically
closeting
confidential
selfishly
hoard
inwardly
independently
solitarily
seminary
inside