strang·er 
/ˈstreɪnʤɚ/ noun
plural strang·ers /ˈstreɪnʤɚ/ noun [count] 1 : someone who you have not met before or do not know
▪ Children are taught not to talk to strangers. ▪ He is a complete/total/perfect stranger to me. 2 : someone who has not experienced something — + to ▪ He is a stranger to losing. [=he does not know what losing is like] — usually used in negative statements ▪ She is no stranger to controversy. [=she has been involved in controversy before] 3 : someone who is in a new and unfamiliar place
▪ “Excuse me. Do you know where the library is?” “I'm sorry. I'm a stranger here myself.” ▪ I'm a stranger to the area. 4 informal a — used to greet someone you have not seen in a long time ▪ Hello, stranger. I haven't seen you in ages.
b — used to say that you hope to see someone again soon ▪ Don't be a stranger, now. Come back real soon.
▪ Children are taught not to talk to strangers. ▪ He is a complete/total/perfect stranger to me.
▪ “Excuse me. Do you know where the library is?” “I'm sorry. I'm a stranger here myself.” ▪ I'm a stranger to the area.
b — used to say that you hope to see someone again soon ▪ Don't be a stranger, now. Come back real soon.
