Calvinism (also called the Reformed tradition or the Reformed faith) is a major branch of Western Christianity following the theological tradition and forms of Christian practice developed by several Reformation era theologians such as John Calvin, Martin Bucer, Heinrich Bullinger, Peter Martyr Vermigli, and Huldrych Zwingli.
Calvinism n : the theological system of John Calvin and his followers emphasizing omnipotence of God and salvation by grace alone
Calvinism \Cal"vin*ism\, n. [Cf. F. Calvinisme.] The theological tenets or doctrines of John Calvin (a French theologian and reformer of the 16th century) and his followers, or of the so-called calvinistic churches. [1913 Webster] Note: The distinguishing doctrines of this system, usually termed the five points of Calvinism, are original sin or total depravity, election or predestination, particular redemption, effectual calling, and the perseverance of the saints. It has been subject to many variations and modifications in different churches and at various times. [1913 Webster]
Lutheranism is a major branch of Western Christianity that identifies with the theology of Martin Luther, a German reformer.
Lutheranism n : teachings of Martin Luther emphasizing the cardinal doctrine of justification by faith alone
Lutheranism \Lu"ther*an*ism\, Lutherism \Lu"ther*ism\, n. The doctrines taught by Luther or held by the Lutheran Church. [1913 Webster]