
die Veröffentlichung
release / publication
The act of making a work, such as a book, film, music, or study, available to the public.
Die Band feierte die Veröffentlichung ihres neuen Albums.
The band celebrated the release of their new album.
publication / release
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release / publication
The act of making a work, such as a book, film, music, or study, available to the public.
Die Band feierte die Veröffentlichung ihres neuen Albums.
The band celebrated the release of their new album.

publication
A work that has been published; a publication.
Die Professorin hat eine lange Liste wissenschaftlicher Veröffentlichungen.
The professor has a long list of academic publications.
The word derives from the verb 'veröffentlichen' (to publish), which in turn is based on the adjective 'öffentlich' (public). A 'Veröffentlichung' (publication/release) is therefore literally the process of making something public.
Der Forscher möchte seine Ergebnisse bald veröffentlichen.
The researcher would like to publish his results soon.
Whether the act (m01) or the work (m02) is meant can be recognized from context. If the word refers to a point in time or an event ('nach der Veröffentlichung' — after the publication/release), the act is meant. If it appears in the plural or is counted ('drei Veröffentlichungen' — three publications), the work is meant.
Kurz nach der Veröffentlichung wurde das Buch zum Bestseller.
Shortly after its release, the book became a bestseller.
When the act of publishing is meant, the noun is often combined with the genitive of the work. Typical verbs are 'ankündigen' (to announce), 'verschieben' (to postpone), or 'feiern' (to celebrate).
Die Veröffentlichung des neuen Videospiels wurde auf nächstes Jahr verschoben.
The release of the new video game was postponed until next year.
to appear
When a work comes out, „erscheinen“ describes the event from the book’s or film’s perspective. „Die Veröffentlichung“ (the publication or release), by contrast, refers to the act initiated by someone that makes the work publicly available. „Erscheinen“ is suitable for the book as the result, while „Veröffentlichung“ is suitable for the publisher’s action.

Der Verlag plant die Veröffentlichung des neuen Romans im September.
The publisher is planning the release of the new novel in September.
Der neue Roman der Autorin erscheint im September.
The author’s new novel will be published in September.