
der Ablauf
sequence
The order of events or steps in a process; the course of an action or event.
Der genaue Ablauf der Zeremonie wird noch bekannt gegeben.
The exact sequence of the ceremony will be announced later.
sequence / drain
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sequence
The order of events or steps in a process; the course of an action or event.
Der genaue Ablauf der Zeremonie wird noch bekannt gegeben.
The exact sequence of the ceremony will be announced later.

expiration
The end of a set deadline or period of validity.
Nach Ablauf der Frist können keine Anträge mehr eingereicht werden.
After the expiration of the deadline, no more applications can be submitted.

drain
A device or opening through which a liquid can flow away; a drain or outlet.
Der Ablauf in der Dusche ist verstopft.
The drain in the shower is clogged.
The word is made up of the prefix 'ab-' and the noun 'Lauf' (from 'laufen' (to run/walk)). The basic idea is that something takes its course and comes to an end or flows away.
Wir müssen den Ablauf der Veranstaltung genau planen.
We have to plan the sequence of the event carefully.
'Der Ablauf' is the noun form of the verb 'ablaufen' (to run its course / expire / drain away). When something 'abläuft', 'der Ablauf' describes this process or its result.
Die Frist ist gestern abgelaufen.
The deadline expired yesterday.
In the meaning of 'process', 'Ablauf' is often combined with adjectives that evaluate the course of events. Common phrases are: 'ein reibungsloser Ablauf' (a smooth process), 'der geplante Ablauf' (the planned sequence), or 'der tägliche Ablauf' (the daily routine).
Dank der guten Organisation hatten wir einen reibungslosen Ablauf.
Thanks to the good organization, we had a smooth process.
This meaning is almost always used in the fixed expression 'nach Ablauf von etwas' (after the expiration of something) or 'nach Ablauf + genitive'. It often introduces a subordinate clause.
Nach Ablauf des Vertrags müssen Sie die Wohnung verlassen.
After the expiration of the contract, you must leave the apartment.
This concrete, technical meaning can be recognized from context. It is used for physical openings through which liquids flow, e.g. in the bathroom or kitchen. Typical surrounding words are 'verstopft' (clogged), 'reinigen' (to clean), or 'Wasser' (water).
Kannst du bitte die Haare aus dem Ablauf der Badewanne entfernen?
Can you please remove the hair from the bathtub drain?
process / trial
Prozess and Ablauf can both describe an orderly sequence of work steps. Prozess additionally emphasizes how the steps work together and develop toward a result, while Ablauf focuses mainly on their chronological order or progression. Use Prozess for the development and Ablauf for the sequence.

Der Ablauf der Antragstellung ist in vier Schritte gegliedert.
The application process is divided into four steps.
Der Prozess der Antragstellung dauert mehrere Wochen und führt zur Genehmigung.
The application process takes several weeks and leads to approval.