Thank you all for your replies. Since Latins are called Roman, why so? What does Roman mean when it is referred to the Western Catholics?
Roman / Latin, refers to the rite. It makes up ~98% of the total of the Catholic Church in the world. The other rites make up ~2%. All rites are of equal dignity, all rites are 100% Catholic
"ROMAN/LATIN FAMILY OF LITURGICAL RITES
The Church of Rome is the Primatial See of the world and one of the five Patriarchal Sees of the early Church (Rome, Constantinople, Alexandria, Antioch and Jerusalem). Founded by St. Peter in 42 AD it was consecrated by the blood of Sts. Peter and Paul during the persecution of Nero (63–67 AD). It has maintained a continual existence since then and is the source of a family of Rites in the West. Considerable scholarship (such as that of Fr. Louis Boyer in Eucharist) suggests the close affinity of the Roman Rite proper with the Jewish prayers of the synagogue, which also accompanied the Temple sacrifices. While the origin of the current Rite, even in the reform of Vatican II, can be traced directly only to the 4th century, these connections point to an ancient apostolic tradition brought to that city that was decidedly Jewish in origin.
After the Council of Trent it was necessary to consolidate liturgical doctrine and practice in the face of the Reformation. Thus, Pope St. Pius V imposed the Rite of Rome on the Latin Church (that subject to him in his capacity as Patriarch of the West), allowing only smaller Western Rites with hundreds of years of history to remain. Younger Rites of particular dioceses or regions ceased to exist.
As a consequence of the Second Vatican Council’s Dogmatic Constitution on the Sacred Liturgy, Pope Paul VI undertook a reform of the Mass of the Roman Rite, promulgating a revised rite with the Missal of 1970. This Missal has since been modified twice (1975 and 2002). Mass celebrated in accordance with this missal is the Ordinary Form of the Roman Rite.
At the time of the revised Missal’s promulgation in 1970 almost all Catholics assumed that the previous rite, that of the Missal of 1962, had been abolished. By decision of the Supreme Pontiff Benedict XVI this general assumption has been declared false and the right of Latin Rite priests to celebrate Mass according to the former missal has been affirmed (Apostolic Letter Summorum Pontificum, 7 July 2007). Mass celebrated in accordance with the Missal of 1962 constitutes the Extraordinary Form of the Roman Rite.
• Roman – The overwhelming majority of Latin Catholics and of Catholics in general.
– Ordinary Form of the Roman Rite. Mass celebrated in accordance with the Missale Romanum of 1970, promulgated by Pope Paul VI, currently in its third edition (2002). The vernacular editions of this Missal, as well as the rites of the other sacraments, are translated from the Latin typical editions revised after the Second Vatican Council.
– Extraordinary Form of the Roman Rite. Mass celebrated in accordance with the Missale Romanum of 1962, promulgated by Blessed Pope John XXIII. The other sacraments are celebrated according to the Roman Ritual in force at the time of the Second Vatican Council. The Extraordinary Form is most notable for being almost entirely in Latin. In addition to institutes which have the faculty to celebrate the Extraordinary Form routinely, such as the Priestly Fraternity of St. Peter and the Institute of Christ the King Sovereign Priest, any Latin Rite priest may now offer the Mass and other sacraments in accordance with norms of Summorum Pontificum."
though I did have to Google parlance. 
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Thanks!!
