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A word that denotes an attribute; esp. a modifying word joined to a noun; an adjective or adjective phrase.

In balanced sentences one part is balanced against another,—a noun and a noun, an adjective and an adjective, phrase and phrase.

Do not use a plural verb after a singular subject modified by an adjective phrase; as, The thief, with all his booty, was captured.

A phrase that does the work of an adjective is called an +Adjective Phrase+.

Of introduces the first phrase, and note is the principal word; the and musical are modifiers of note; upon introduces the second phrase, and rapidity is the principal word; the and the adjective phrase of vibration are modifiers of rapidity; of introduces this phrase, and vibration is the principal word.