Soon after the house met, Speaker Sumitra Mahajan called Abdullah, who took oath in Kashmiri. Later, he was greeted by Prime Minister Narendra Modi and other leaders.
Abdullah won the by-poll from the Srinagar-Budgam parliamentary constituency, defeating his Peoples Democratic Party rival Nazir Ahmed Khan by over 10,000 votes.
Abdullah had lost in 2014 to the then PDP candidate Tariq Karra, who is now with the Congress.
The Srinagar seat fell vacant after Karra resigned from the PDP.
Kunhalikutty, who took oath in English, won the Malappuram by-poll in Kerala. He defeated Communist Party of India-Marxist candidate and youth leader M.B. Faisal.
The re-poll was necessitated by the death of sitting MP and Indian Union Muslim League leader E. Ahamed.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)