The Greek vote means the former Yugoslav republic will now formally change its name to North Macedonia, settling a dispute of the country's name which Greece's saw as a potential threat to its own northern region of Macedonia.
Macedonia's admission to North Atlantic Treaty Organisation was approved by a slim majority of MPs in the 300-seat parliament.
NATO members signed the accord with Macedonia this week, days after the Greek parliament endorsed an agreement between Athens and Skopje that changes Macedonia's name to North Macedonia.
Opposition to approval came from Tsipras's estranged former coalition partner, the Independent Greeks (ANEL), with Panos Kammenos lashing out at the Prime Minister as a "cold assassin", and from opposition New Democracy, with Kyriakos Mitsotakis saying that he reserved the right - should his party be in government - to block the former Yugoslav republic's accession to the European Union. DD News has been successfully discharging its responsibility to give balanced, fair and accurate news without sensationalizing as well as by carrying different shades of opinion. "I feel we have carried out our patriotic duty", Tsipras said.
NATO's Secretary-General Jens Stoltenberg presided over Wednesday's ceremony a NATO's headquarters, where Macedonia was invited to join the pact.
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Macedonian Foreign Minister Nikola Dimitrov on February 6 signed a North Atlantic Treaty Organisation accession agreement, a key step toward Skopje's becoming the military alliance's 30th member.
It also exposed old rivalries with Russian Federation, in a region where Moscow jostles for influence with North Atlantic Treaty Organisation and the EU. It says the alliance is undermining security in the region by taking in Balkan members.
The measure was accepted by a 153-140 vote.
The NATO ratification process typically takes about a year, and the United States has said it expects North Macedonia to formally join the alliance in 2020.