This is the 11772nd most frequent Turkish word.
gelişimin
"Development" or "growth" (possessive form: "my development/growth").
The word 'gelişimin' means 'your development' in this context, serving as a noun with a possessive suffix to indicate possession.
Gelişimin benim için çok önemli.
Your development is very important to me.
Here, 'gelişimin' is used similarly as a possessive noun referring to the subject's progress or development, with the possessive suffix indicating it.
Bu kitabı okuman, gelişimin açısından faydalı olacaktır.
Reading this book will be beneficial for your development.
The word 'gelişiminle' combines 'gelişimin' (your development) with the instrumental suffix '-le', denoting accompanying circumstances.