|Origin:||estrangier, from estrange; STRANGE1|
someone that you do not know:
Children must not talk to strangers.
perfect/complete/total stranger (=used to emphasize that you do not know them)! Do not use stranger to mean 'a person from another country'. Use foreigner or, more politely, 'a person from abroad/overseas '.
Julie finds it easy to speak to complete strangers.
to have had a lot of a particular kind of experience:
a politician who is no stranger to controversy
someone in a new and unfamiliar place:
'Where's the station?' 'Sorry, I'm a stranger here myself.'
used to greet someone who you have not seen for a long time
used when someone is leaving to invite them back to see you soon