die Gründung
founding
The act of bringing an organization, company, city, or institution into existence.
Die Gründung des Vereins erfolgte im Jahr 1995.
The founding of the association took place in 1995.

founding / foundation
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founding
The act of bringing an organization, company, city, or institution into existence.
Die Gründung des Vereins erfolgte im Jahr 1995.
The founding of the association took place in 1995.

'Die Gründung' (the founding / foundation) is the noun formed from the verb 'gründen' (to found). The process of founding a company is called 'die Gründung' (the founding).
Die Gründung eines eigenen Unternehmens erfordert viel Planung.
Founding your own company requires a lot of planning.
The word has two main meanings. In the context of history or business, it means bringing something into existence. In construction, it refers to the foundation of a building.
Wir feiern den 100. Jahrestag der Gründung unserer Stadt.
We are celebrating the 100th anniversary of the founding of our city.
In connection with organizations, 'Gründung' (founding) is often used with the genitive or 'von' (of) to say what was founded. Typical verbs are 'erfolgen' (to take place) or 'feiern' (to celebrate).
Er war bei der Gründung des Fußballvereins von Anfang an dabei.
He was involved in the founding of the soccer club from the very beginning.
The meaning 'Fundament' (foundation) is mainly used in the technical language of construction. In everyday life, you rarely hear this word in this context.
Für den Bau des Hochhauses ist eine tiefe Gründung im Boden notwendig.
A deep foundation in the ground is necessary for the construction of the high-rise.
start
'der Start' and 'die Gründung' both have to do with a beginning. However, 'der Start' is more general and fits projects, activities, careers, or new phases. 'die Gründung' is used when an organization, company, city, or institution is officially brought into existence. Learners may confuse the words because both describe the beginning of something new. When it is about the first step or the beginning of work, 'Start' is more natural. When something new is officially created, especially a company or an association, 'Gründung' is more precise.

Nach der Gründung des Vereins kamen schnell viele neue Mitglieder dazu.
After the association was founded, many new members quickly joined.
Der Start des neuen Projekts war stressig, aber das Team war motiviert.
The start of the new project was stressful, but the team was motivated.