
etwas vereinbaren
to agree on
To make a mutual agreement about something, for example about an appointment, a price, or conditions.
Wir haben vereinbart, uns nächste Woche Dienstag um 10 Uhr zu treffen.
We agreed to meet next Tuesday at 10 o'clock.
to agree / reconcile
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to agree on
To make a mutual agreement about something, for example about an appointment, a price, or conditions.
Wir haben vereinbart, uns nächste Woche Dienstag um 10 Uhr zu treffen.
We agreed to meet next Tuesday at 10 o'clock.

to reconcile
To bring two or more things that seem to contradict each other into harmony or make them compatible with each other.
Es ist oft schwierig, die anspruchsvolle Arbeit mit dem Familienleben zu vereinbaren.
It is often difficult to reconcile demanding work with family life.
'Vereinbaren' (to agree / reconcile) is an inseparable verb. The prefix 'ver-' is never separated from the verb stem, not even in a main clause.
Die beiden Firmen vereinbarten eine engere Zusammenarbeit.
The two companies agreed on closer cooperation.
When talking about arrangements or agreements, 'vereinbaren' (to agree on) is very often used with these nouns: 'einen Termin vereinbaren' (to arrange an appointment), 'einen Preis vereinbaren' (to agree on a price), 'ein Treffen vereinbaren' (to arrange a meeting), or 'Zahlungsbedingungen vereinbaren' (to agree on payment terms).
Können wir für nächste Woche einen neuen Termin vereinbaren?
Can we arrange a new appointment for next week?
When agreeing on an action, an infinitive construction with 'zu' or a subordinate clause with 'dass' often follows. The pattern is: 'vereinbaren, etwas zu tun' (to agree to do something) or 'vereinbaren, dass etwas passiert' (to agree that something happens).
Wir haben vereinbart, die Kosten zu teilen.
We agreed to share the costs.
In the meaning of 'in Einklang bringen' (to bring into harmony), 'vereinbaren' (to reconcile) is always used with the preposition 'mit' and the dative. The structure is: etwas (accusative) mit etwas (dative) vereinbaren.
Sie findet es schwer, ihre Hobbys mit den langen Arbeitszeiten zu vereinbaren.
She finds it hard to reconcile her hobbies with the long working hours.
to organize
When planning a meeting, organisieren refers to the entire preparation, such as arranging the room, schedule, and technology. Vereinbaren, by contrast, emphasizes that several people jointly set a date or other conditions. Organisieren fits the practical preparation, while vereinbaren fits reaching a mutual agreement.

Mia vereinbart mit allen Teilnehmern den Termin für das Treffen.
Mia agrees on the date for the meeting with all the participants.
Mia organisiert für das Treffen einen Raum und die nötige Technik.
Mia is organizing a room and the necessary technology for the meeting.