Mantrams — verses from the Vedas. In the exoteric sense a mantram (or that psychic faculty or power that conveys perception or thought) is the older portion of the Vedas, the second part of which is composed of the Brahmanas. In esoteric phraseology mantram is the word made flesh, or rendered objective through divine magic. A form of words or syllables rhythmically arranged, so that when sounded certain vibrations are generated.
(Alice A. Bailey "Initiation, Human and Solar")