
die Eröffnung
opening
The act of making a shop, exhibition, or public institution accessible to the public for the first time.
Zur Eröffnung des neuen Museums kamen tausende Besucher.
Thousands of visitors came to the opening of the new museum.
opening
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opening
The act of making a shop, exhibition, or public institution accessible to the public for the first time.
Zur Eröffnung des neuen Museums kamen tausende Besucher.
Thousands of visitors came to the opening of the new museum.

opening
The beginning or introduction of an event, gathering, or text.
Nach der Eröffnung durch den Bürgermeister begannen die Vorträge.
After the opening by the mayor, the presentations began.

opening
The formal announcement or beginning of an official process, e.g. a will or court proceedings.
Die Eröffnung des Insolvenzverfahrens wurde heute im Amtsblatt verkündet.
The opening of the insolvency proceedings was announced today in the official gazette.

opening
The first moves in a game of chess or a similar strategy game.
Er spielt am liebsten die Italienische Eröffnung.
He most enjoys playing the Italian Opening.
'Die Eröffnung' (the opening) is the nominalization of the verb 'eröffnen' (to open). This formation with the ending '-ung' is very common in German for turning a verb into a feminine noun.
Wir planen, das neue Café im Mai zu eröffnen.
We are planning to open the new café in May.
To say what is being opened, you often use the genitive or the preposition 'von' (of/by). In written language, the genitive is common, for example 'die Eröffnung des Festivals' (the opening of the festival).
Die Eröffnung des neuen Flughafens wurde verschoben.
The opening of the new airport was postponed.
In this meaning, 'Eröffnung' is often combined with adjectives like 'feierlich' (ceremonial) or 'groß' (grand). Typical nouns are 'Geschäft' (shop), 'Ausstellung' (exhibition), or 'Filiale' (branch).
Die feierliche Eröffnung des neuen Theaters zog viele Prominente an.
The ceremonial opening of the new theater attracted many celebrities.
When 'Eröffnung' means the beginning of an event, it is often used in connection with 'Konferenz' (conference), 'Sitzung' (meeting/session), or 'Veranstaltung' (event). A person then often gives an 'Eröffnungsrede' (opening speech).
Die Eröffnung der Konferenz übernimmt der Rektor der Universität.
The rector of the university will take over the opening of the conference.
In a legal context, 'Eröffnung' is a fixed term. People speak of the 'Eröffnung eines Insolvenzverfahrens' (opening of insolvency proceedings) or the 'Eröffnung eines Testaments' (opening of a will).
Das Gericht hat die Eröffnung des Verfahrens beschlossen.
The court decided to open the proceedings.
In chess, 'die Eröffnung' refers to an established sequence of the first moves of a game. These openings often have names, such as 'die Sizilianische Eröffnung' (the Sicilian Opening).
Ein guter Schachspieler kennt viele verschiedene Eröffnungen.
A good chess player knows many different openings.
introduction / initiation
Die Eröffnung and die Einleitung can both occur at the beginning of an event or speech. Die Eröffnung refers more to the formal start, whereas die Einleitung leads into the topic. Use Eröffnung for the official start and Einleitung for the explanatory beginning of content.

Die Eröffnung der Konferenz findet am Montag um neun Uhr statt.
The conference opening will take place on Monday at nine o’clock.
Die Einleitung des Vortrags erklärt zunächst das gemeinsame Ziel.
The introduction to the presentation first explains the common goal.