Adithanar's sister, Vamasundari Devi, was mother of Indian businessman Shiv Nadar.

He expanded operations by opening additional editions in Tirunelveli, Madras, Salem and Tiruchirapalli in the 1940s.

By bringing out local editions, Dina Thanthi helped deliver news on the same day to the people in southern districts of Tamil Nadu, who until then had to read day-old newspapers printed in Madras.

[8] Other publications from Adithanar's Dina Thanthi group include the evening daily Maalai Murasu (lit.

He contested and won the 1952 election from Tiruchendur as a candidate of T. Prakasam's Kisan Mazdoor Praja Party.

It wanted the creation of a homogeneous Greater Tamil Nadu incorporating Tamil-speaking areas of India and Sri Lanka.

In 1960, the party organised statewide protests for the secession of Madras and the establishment of a sovereign Tamil Nadu.

[4][13][14] On 17 March 1967, Adithanar became the speaker of the assembly defeating the Swatantra Party candidate K. S. Kothandaramiah, by 153 votes to 21.

He defended himself as:[15] I am as much as a politician as leader of the opposition is and as such, I can not refrain myself from the party activities of the DMK with whose support and under whose symbol I have been elected to the Assembly.

[4][16] The DMK split in 1972, with M. G. Ramachandran forming the Anna Dravida Munnetra Kazhagam (ADMK).

In 2005, the then Tamil Nadu Chief Minister, J. Jayalalitha announced that his home in Srivaikuntam, built in 1928, would be converted into a memorial.

200,000 are awarded to Tamil scholars and people who excel in literature by Adithanar's son and the current director of the Dina Thanthi group, Sivanthi Adithan.