The word “socialist” was added to the Constitution by Indira Gandhi during the 70s.

This was during her “Emergency” when Parliament was essentially dysfunctional.

There have been campaigns to remove her changes, but nothing has come of it.

I found a copy of the text here: https://legislative.gov.in/constitution-of-india/

English version: https://cdnbbsr.s3waas.gov.in/s380537a945c7aaa788ccfcdf1b99b...

In the preamble (p32), I see this text:

    > WE, THE PEOPLE OF INDIA, having solemnly resolved to constitute India into a [SOVEREIGN SOCIALIST SECULAR DEMOCRATIC REPUBLIC] and to secure to all its citizens:

That said, I don't know how constitutional amendments work in India. This text may have been amended at a later date, but the original text remains.

“Socialist” and “Secular” were added by Indira Gandhi when she had declared an Emergency after being disqualified by a high court.

https://en.wikipedia.org/wiki/Forty-second_Amendment_of_the_...