As a Noun: 1. The first part of an activity. English = start, beginning. 2. The first part of a book or a film. English = opening, beginning. 3. The start of a large and important activity, or the official announcement of when a new product is made available to the public. English = opening, launch. As a Verb or Adjective: 1. To do something which is the first part of an activity, or the first part of a text (such as a book or a film). English = start, begin, open. 2. To move something, such as a door or a lid on a box, so that it no longer covers a hole or a gap; to move, remove, or cut part of a thing such as a cupboard, container, or letter so that you can take out what is inside. English = open. 3. To tell people at a special ceremony that a new product is available to the public. English = launch.