definitely
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definitely
Expresses that something will happen, or is the case, under all circumstances, with certainty, or absolutely. It is the opposite of 'auf keinen Fall' (under no circumstances / definitely not).
Ich komme aufjedenfall zu deiner Party, versprochen!
I will definitely come to your party, I promise!
This word can be written in two ways: as one word, 'aufjedenfall', or separately, 'auf jeden Fall'. The separate spelling is the traditional one and is still the more common variant in formal texts.
Wir müssen uns auf jeden Fall noch einmal treffen.
We definitely have to meet again.
As an adverb, 'auf jeden Fall' (definitely / in any case) is flexible. It can stand at the beginning of the sentence (position 1), in which case the verb follows. But it can also stand inside the sentence, usually after the conjugated verb.
Auf jeden Fall müssen wir heute noch die Tickets buchen.
In any case, we still have to book the tickets today.
'Aufjedenfall' (definitely) is used to strongly confirm a statement or to remove any doubt. It signals that something applies with certainty and without exception.
Das war aufjedenfall die richtige Entscheidung.
That was definitely the right decision.
certain / specific
'bestimmt' and 'auf jeden Fall' can both express that something is certain or very likely. 'bestimmt' often sounds like a strong assumption: you are quite sure, but there may still be a little uncertainty. 'auf jeden Fall' is stronger and means more like: it will definitely happen, or you absolutely want to do something. Learners may confuse the words because both show certainty. As a simple guide: 'bestimmt' often fits for an assumption, while 'auf jeden Fall' fits better for a firm promise or decision. The correct spelling is 'auf jeden Fall', not 'aufjedenfall'.
Tom hat nach der Nachricht auf jeden Fall noch einmal angerufen.
Tom definitely called again after the message.
Meine Nachbarin kommt bestimmt später, weil sie heute lange arbeiten muss.
My neighbor will certainly come later because she has to work late today.