preacquaintance
knew someone
preknowledge
in
acquaintanced
acquainted
intimate
close to home
acquaintance
familiarity
boo
conversancy
conversance
sometime
be no stranger to
reacquaintance
knew someone when
friend
kith
knowing
orient
unacquainted
conversant
know
mucker
bygone
on one's own ground
familiarly
au fait
refamiliarise
buddy
yesterday
ex-friend
friend of a friend
quondamly
prehodiernal
semiacquaintance
afterknowledge
you learn something new every day
unacquaintedly
knew
defamiliarize
earlier on
good old days
background
elder
prehesternal
just then
whilom
at someone's service