In general, the term Saint refers to someone who is exceptionally virtuous and holy. It can be applied to both the living and the dead and is an acceptable term in most of the world's popular religions. The Saint is held up by the community as an example of how we all should act, and his or her life story is usually recorded for the edification of future generations.

The process of officially recognizing a person as a Saint, practiced by some churches, is called canonization and serves to hold up those individuals as role models and heroes of Christian virtue. Protestant groups object to this and use only the less formal, broader usage seen in Scripture to include all who are faithful as saints.

Etymology

The term Saint is derived from the Latin Sanctus meaning “Holy”. This is a direct translation from the Greek word άγιος (hagios) also meaning “Holy”. In its original scriptural usage it simply means “Holy” or “Sanctified”. In this form it can be applied to a “Holy” person, a place, a thing, such as Scripture itself  - The Holy Spirit). But very soon the early Christians began to using the term “Saint” more narrowly to refer to a specific, exemplary individual. (For a lexical explanation, see Liddel & Scott. [1])

The earliest known occurrence of άγιος as "Saint" seems to be in The Shepherd of Hermas, chapter 5 (or 13, depending on how chapters are counted), verse 2. "The Shepherd" was authored at about the same time as 2 Peter.

Short form

Abbreviation for the term Saint is usually “St.” or “St”; in cases where multiple Saints are referenced SS. is the norm.

Historicity

Some theologians believe that many people venerated as Saints never actually existed. The polite term for such "Saints" is ahistorical. Sorting out exactly which Saints are ahistorical is difficult, because of the larger difficulty of proving a negative: the absence of independent records of a Saint's existence doesn't prove she or he never existed; indeed there are no specific records of the existence of many people who lived before the 20th century. The Acta Sanctorum (hagiographical work) of the Bollandists forms a major part of the historiography of named Saints.

There are a large number of Christian saints with what appear to be pagan names. Most likely they were pagans who converted to Christianity and subsequently became Saints. However, it is possible that some pre-Christian deities (especially in Rome's area) were accidentally adopted as saints. It is thought that some cults were “Christianized” in a fairly direct manner. The basis for this is usually a similarity of names. For example, it is now commonly asserted that Saint Brigid was based on the Celtic goddess Brigid. The goddess was popular long before Christianity reached Ireland. Another possibility is the melding of the actual life of the Saint with myths related to pre-Christian gods and heroes (see Comparative religion). There are some striking parallels to the events portrayed in the lives of certain saints and fables such as Androcles and the Lion.

Definition specific to religion

Christianity

Roman Catholicism

In the Roman Catholic church, the title of Saint - with a capital 'S' - refers to a person who has been formally canonized (officially recognized) by the Church. Formal Canonization is a lengthy process often taking many years, even centuries. The process includes a thorough investigation of the individual who has been put forth as a candidate for Sainthood. This investigation typically is concerned with examining and confirming (or disproving) any number of visions or miracles that may have been attributed to the person in question, or of the general holiness or specific good deeds that he or she may have done while alive. It should be noted, however, that the Church places special weight on those miracles or instances of intercession that happened after the individual died and which are seen to be demonstrative of the Saint's continued special relationship with God after death. Also, by this definition there are many people in heaven who have not been formally declared as Saints (most typically due to their obscurity and the involved process of formal canonization) but who may nevertheless generically be referred to as saints (lowercase 's').

While it can at times seem so, Saints are not worshiped — this would violate the Ten Commandments — but are asked for their help or their own prayer for a person. Some Saints intercede for specific problems: a "patron saint".

Once a person has been declared a Saint, the body of the Saint is considered holy. In past centuries, the remains of Saints were distributed as holy artifacts. In modern times, however, there is a growing trend to respect the body of a Saint, leaving it alone and buried.

Eastern Orthodoxy

In the Eastern Orthodox Church a Saint is defined as anyone who is currently in Heaven, whether recognized here on earth, or not. By this definition, Adam and Eve, Moses, the various Prophets, the Angels and Archangels are all given the title of "Saint". Saints are not given the title by men, but by God

The Orthodox believe that God reveals his Saints to us, often by answered prayers and other miracles. For the Orthodox, the formal recognition of a Saint often happens many years after they have been recognized by a localized community. There are numerous small local followings of countless saints that have not yet been recognized by the entire Orthodox church. After a careful process of deliberation by a synod of Bishops, there is a formal service of Glorification in which a Saint is recognized by the entire church.

Such was the case with the sainthood of Tsar Nicholas II of Russia and his family. At first the members of the Royal family were recognized as martyrs by the Russian Orthodox Church Abroad in 1981, after which many believers in Russia began to pray to the Tsar and his family. Miracles were reported, including one miraculous icon which prompted an immediate local glorification. In 2000, the Tsar and his family were officially Glorified by the Russian Orthodox Church.

A strong proponent of a saint's canonization can be a miraculous condition of their relics (although it is not in itself alone considered sufficient). In Orthodox countries it is often the custom to re-use graves after 3 to 5 years because of the limited space. Bones are respectfully washed and placed in an ossuary, often with the person's name written on the skull. Occasionally when a body is exhumed something miraculous occurs to reveal the person's Sainthood. There have been numerous occurrences where the exhumed bones suddenly give off a wonderful fragrance, like flowers; or sometimes the body is incorrupted, just as it was on the day the person died, despite having not been embalmed (traditionally the Orthodox do not embalm the dead) and having been buried for 3 years.

The reason relics are considered sacred is because, for the Orthodox, the separation of body and soul is unnatural. Body and soul both comprise the person, and in the end, body and soul will be reunited; therefore, the body of a saint shares in the “Holiness” of the soul of the saint.

Because the Church shows no true distinction between the living and the dead (the Saints are alive in Heaven), the Orthodox treat the saints as if they were still here. They venerate them and ask for their prayers, and consider them brothers and sisters in Christ Jesus. Saints are venerated and loved and asked to intercede for our salvation, but it should be clearly understood that they are not Worshiped; their holiness is from God who alone is worthy of Adoration. As Christ says in the Gospels, "Thou shalt worship the Lord thy God, and him only shalt thou serve." (Matt 4:10). The relics of Saints are highly respected, even more so than the Roman Catholics. As a general rule only clergy will touch relics in order to move them or carry them in procession, however, in veneration the faithful will kiss the relic to show love and respect toward the saint. Every altar in every Orthodox church contains relics, usually of martyrs. The Church building interiors are covered with the Icons of saints.

In the Orthodox Church, baptism is the moment one is born again into Christ. The person entering the baptismal font is not the same person that emerges. It is for this reason that the person is given a new name; always the name of a saint. What is proper is that the person no longer goes by his old name because that person is dead, but uses the new name exclusively. It is also common that instead of birthdays, the person celebrates his Saints Day, the day on the Calendar of Saints ascribed to that particular saint.

In Orthodox tradition some saints are known by the title Equal-to-apostles in recognition of their role in evangelising countries.

Protestantism

In many Protestant churches, the word is used more generally to refer to anyone who is a Christian. This is similar in usage to St. Paul's numerous references. In this sense, anyone who is within the Body of Christ is “Holy” because of their relationship with Jesus. However, high-church Anglicans and Episcopalians use the term "saint" similarly to the manner in which Catholics use it.

Latter-day Saints

Members of The Church of Jesus Christ of Latter-day Saints follow the Protestant tradition described above, referring to themselves as "Latter-day Saints", or simply "Saints". This is usually preferred over the nickname "Mormons".

Islam

Islam has, traditionally, had a central place for saints within its cosmology and saints [Arabic: awliya--literally, Friends of Allah (singular: wali)] are mentioned in verses of the Qur'an. Although there is no formal canonization process in Islam, there do exist traditions of the Prophet (hadith) and sayings of the scholars of Islam about what the qualities of a true saint are. These include soundness of faith (aqidah), a strict adherence to the Prophetic traditions (sunnah) and Shar'iah Law, an upright moral character, the performance of charismatic marvels (Ar.: karamat) and, crucially, the acknowledgment by consensus of the orthodox that such and such a person is a saint. i.e. if the Muslim masses consider someone a Saint, he or she is one. Theoretically too a saint is said to have the ability to perform any miracle which the Prophet performed and there is also a spiritual hierarchy of saints in Islam with the Qutb or Ghawth (Pole or Succour) at the apex. This hierrarchy is detailed in the work of the great Andalusian Sufi Muhyuddin Ibn al-Arabi, who is considered one of the great Saints of Islam, as well as many others. Indeed, amongst orthodox, traditional, Muslims, those referred to as [Sufis] by Orientalist scholars of Islam are considered Saints and the two terms are virtually synonyms.