1. Last stage of life:
* Similar to "old age" or "twilight years".
* It refers to the final years of a person's life, often associated with weakness, illness, and the nearing of death.
2. End of an era:
* It can also denote the end of a particular time period or era.
* This could be the end of a reign, a historical period, or even a significant event in one's life.
3. Final moment/point:
* In a more general sense, it can simply mean the final moment or point of something.
* For example, the final decision, the final destination, etc.
Therefore, the exact meaning of "thonniyavasam" depends on the context in which it is used. However, it always carries a connotation of finality, conclusion, and end.