Hungarian Prime Minister Viktor Orban conceded defeat in Sunday's parliamentary elections, as partial results showed the opposition Tisza party securing a majority.

"The election results, though not yet final, are clear and understandable; for us, they are painful but unambiguous," Orban told reporters.

"We have not been entrusted with the responsibility and opportunity to govern. I congratulated the winning party," he said.

Peter Magyar, leader of Tisza, said on social media that Orban had called to congratulate him on the party's victory.

With 89.97 percent of the votes counted by the National Election Office, Tisza secured 53.72 percent of the vote, projecting to win 138 seats. Orban's ruling coalition of Fidesz and the Christian Democratic People's Party (KDNP) received 37.67 percent and is projected to win 54 seats.

The far-right Our Homeland Movement won 5.94 percent and is projected to take 7 seats. A candidate representing the Roma minority did gain enough support for a seat, while the other parties in the race failed to clear the 5-percent threshold required to enter parliament.

About 7.52 million Hungarians cast their ballots, out of around 8.1 million eligible voters, marking a record-high turnout of approximately 77.8 percent.

Under Hungary's electoral law, parliamentary elections are held every four years. Hungary's parliament has 199 seats, including 106 elected directly in single-member constituencies and 93 allocated among parties that enter parliament.