Mantra
A mystical formula or invocation; a word or formula, often in Sanskrit, to be recited or sung for the purpose of intensifying the action of the Spirit of God in man. A form of prayer consisting of a word or a group of words that is chanted over and over again to magnetize a particular aspect of the Deity or of a being who has actualized that aspect of the Deity.
See also
Sources
Mark L. Prophet and Elizabeth Clare Prophet, Saint Germain On Alchemy: Formulas for Self-Transformation.