This is a word of Persian origin, and is used in the Septuagint as the translation of Eden. It means "an orchard of pleasure and fruits," a "garden" or "pleasure ground," something like an English park. It is applied figuratively to the celestial dwelling of the righteous, in allusion to the garden of Eden. (2 Corinthians 12:4; Revelation 2:7) It has thus come into familiar use to denote both that garden and the heaven of the just.
Smith’s Bible Dictionary
Paradise
Smith’s Bible Dictionary, William Smith (1863). Public domain, from the CrossWire SWORD module.