C1 noun /ˌsʌb.stɪˈtjuː.ʃən/
substitution
प्रतिस्थापन
Meaning
the action of replacing someone or something with another
Example
The substitution of the old system with the new one was difficult.
पुराने सिस्टम को नए सिस्टम से बदलना कठिन था।