To make large or larger in volume, extent, capacity, amount, importance, etc.; enlarge or make more ample.To expand in stating or describing; treat copiously, so as to present in every point of view and in the strongest lights.Synonyms To expand, develop, extend, dilate, magnify.. To grow or become ample or more ample.To discourse more at length; speak largely or copiously; be diffuse in argument or description; expatiate; dilate: commonly with on or upon before an object: as, to amplify on the several topics of discourse.