/ Dictionary / Index C class act: Meaning and Definition of Find definitions for: class' act' Pronunciation: [key] — Informal. Informal. something or someone regarded as outstanding or elegant in quality or performance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. class class action Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language