Kennenlernen vs. treffen
While both German words kennenlernen and treffen can be translated as to meet in English, they are not interchangeable. They describe different types of encounters. Kennenlernen refers specifically to meeting for the first time and getting acquainted, whereas treffen refers to meeting up with someone, usually someone you already know.
Kennenlernen
A1This verb means to meet for the first time or to get to know. It emphasizes the initial introduction and the process of becoming acquainted with a person, a place, or even a concept. It is a separable verb, so kennen and lernen split in many sentence structures.
Ich habe meinen besten Freund in der Schule kennengelernt.
(I met my best friend for the first time in school.)
Wir wollen im Urlaub die italienische Kultur kennenlernen.
(We want to get to know the Italian culture on vacation.)
Es war schön, Sie kennenzulernen.
(It was nice to meet you.)
Wann lernst du endlich meine Eltern kennen?
(When are you finally going to meet my parents?)
Im neuen Job muss man viele Prozesse kennenlernen.
(In a new job, one has to get to know many processes.)
Ich möchte dich gerne besser kennenlernen.
(I would like to get to know you better.)
Treffen
A1This verb means to meet in the sense of a planned arrangement or a chance encounter with someone you already know. It can also be used reflexively (sich treffen) to mean to meet up. The focus is on the event of gathering, not the initial introduction.
Ich treffe Anna um 15 Uhr vor dem Kino.
(I am meeting Anna at 3 p.m. in front of the cinema.)
Gestern habe ich zufällig meinen alten Nachbarn getroffen.
(Yesterday I happened to meet my old neighbor by chance.)
Wollen wir uns am Freitag auf einen Kaffee treffen?
(Do we want to meet up for a coffee on Friday?)
Das Komitee trifft sich einmal im Monat.
(The committee meets once a month.)
Wir haben unsere Freunde letztes Wochenende in der Stadt getroffen.
(We met our friends in the city last weekend.)
Ich muss den Anwalt morgen um 10 Uhr treffen.
(I have to meet the lawyer tomorrow at 10 a.m.)
Summary
In short, you use kennenlernen for the very first encounter when you are introduced to someone or something new. For all subsequent meetings, planned get-togethers, or chance run-ins with people you already know, you use treffen. Once you have kennengelernt a person, you can treffen them many times after that.