ENVELOPE; ENVELOP n. 4 definitions
system being allowed to vary according to some continuous law. Thus, any curve is the envelope of its tangents. push the envelope. It is used to refer to the maximum performance available at the current state of the technology, and therefore refers to a class of machines in general, not a specific machine. push the en…
AIR n.
A musical idea, or motive, rhythmically developed in consecutive single tones, so as to form a symmetrical and balanced whole, which may be sung by a single voice to the stanzas of a hymn or song, or even to plain prose, or played upon an instrument; a melody; a tune; an aria.