availability / order
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to be/make available
A fixed expression meaning that something or someone is available or is made available.
Der Konferenzraum steht Ihnen ab 14 Uhr zur Verfügung.
The conference room is available to you from 2 p.m.
The most common use is in fixed expressions. 'Jemandem (dative) etwas zur Verfügung stellen' means to make it available to someone. 'Etwas steht jemandem (dative) zur Verfügung' means that it is available.
Ich stelle Ihnen die Dokumente gerne zur Verfügung.
I would be happy to make the documents available to you.
As a standalone noun without 'zur', 'die Verfügung' (order/injunction) is a formal term from legal and administrative language. It refers to an official order.
Die Stadt erließ eine Verfügung zum Schutz der Anwohner vor Lärm.
The city issued an order to protect residents from noise.
The expression 'die Verfügung über etwas haben' (to have control over something) means to have the control or the right to use something. It is always used with the preposition 'über' (over/about) and the accusative.
Nach dem Tod der Eltern hatte der älteste Sohn die alleinige Verfügung über das Vermögen.
After the death of the parents, the eldest son had sole control over the assets.
decision
'die Entscheidung' and 'die Verfügung' can both refer to an official decision. But 'Entscheidung' is more general: a person, court, or authority chooses between options and reaches a result. 'Verfügung' sounds more like an official, usually written order that must be followed. Learners may confuse the words when dealing with authorities or courts. Practically speaking: the result is often called 'Entscheidung', while the written order from an authority is more likely to be called 'Verfügung'.
Wegen der neuen Verfügung darf das Gebäude ab Montag nicht mehr betreten werden.
Because of the new order, the building may no longer be entered from Monday onward.
Die Entscheidung der Behörde kam erst nach drei Wochen.
The authority's decision did not arrive until three weeks later.