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Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future. Time is a component quantity of many measurements used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience. The temporal position of events with respect to the transitory present is continually changing; events happen, then are located further and further in the past. Time has been a major subject of religion, philosophy, and science, but defining it in a manner applicable to all fields of study without circularity has consistently eluded scholars. A simple definition states that "time is what clocks measure".

Time is one of the seven fundamental physical quantities in the International System of Units. Time is used to define other quantities — such as velocity — so defining time in terms of such quantities would result in circularity of definition. An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called spacetime bring questions about space into questions about time, questions that have their roots in the works of early students of natural philosophy.

Person of the Year (formerly Man of the Year) is an annual issue of the United States newsmagazine Time that features and profiles a person, group, idea or object that "for better or for worse, ...has done the most to influence the events of the year."

The tradition of selecting a Man of the Year began in 1927 with Time editors contemplating newsworthy stories possible during a slow news week. The idea was also an attempt to remedy the editorial embarrassment earlier that year of not having aviator Charles Lindbergh on its cover following his historic trans-Atlantic flight. By the end of the year, it was decided that a cover story featuring Lindbergh as the Man of the Year would serve both purposes.

Since then, individual people, classes of people, the computer, and Planet Earth have all been selected for the special year-end issue. In 1989, the title was changed to Person of the Year. However, the only woman to win the renamed recognition individually have been "The Whistleblowers" (Cynthia Cooper, Coleen Rowley, and Sherron Watkins in 2002) and Melinda Gates (jointly with Bill Gates and Bono in 2005). Before that, four women were granted the title as individuals as Woman of the Year–Wallis Simpson in 1936, Soong May-ling (Madame Chiang Kai-shek) in 1937, Queen Elizabeth II in 1952, and Corazon Aquino in 1986. Several classes of people comprise both men and women or women only, namely Hungarian Freedom Fighter in 1956, "U.S. Scientists" in 1960, Twenty-Five and Under in 1966, The Middle Americans in 1969, "American Women" in 1975, "The American Soldier" in 2003, You in 2006, and "The Protester" in 2011 (represented on the cover by a woman).

A person is a being, such as a human, that has certain capacities or attributes constituting personhood, the precise definition of which is the subject of much controversy.^{[vague language]} The common plural of "person", "people", is often used to refer to an entire nation or ethnic group (as in "a people"), so the plural "persons" is often used in contexts which require precision such as philosophical and legal writing.

In ancient Rome, the word "persona" (Latin) or "prosopon" (πρόσωπον: Greek) originally referred to the masks worn by actors on stage. The various masks represented the various "personae" in the stage play, while the masks themselves helped the actor's voice resonate and made it easier for the audience to hear.

In Roman law, the word "persona" became used to refer to a role played in court, and it became established that it was the role rather than the actor that could have rights, powers, and duties, because different individuals could assume the same roles, the rights, powers, and duties followed the role rather than the actor, and each individual could act in more than one role, each a different "person" in law.^{[tortured english][citation needed]}

Year 1951 (MCMLI) was a common year starting on Monday (link will display the full calendar) of the Gregorian calendar.