the act of amplifying or the state of being amplified.

expansion of a statement, narrative, etc., as for rhetorical purposes

In the revision, the story underwent considerable amplification.

a statement, narrative, etc., so expanded

The text of the second edition was an amplification.

the matter or substance used to expand an idea, statement, or the like

He added an extra paragraph to his speech as an amplification.

Electricity . increase in the strength of current, voltage, or power.

Genetics . gene amplification.

noun

abridgement , compression , condensation , contraction , decrease , lessening , shortening

noun

addition , augmentation , boost , boosting , buildup , deepening , development , elaboration , enlargement , exaggeration , expansion , expatiation , extension , fleshing out , heightening , intensification , lengthening , magnification , padding , raising , strengthening , stretching , supplementing , upping , widening , aggrandizement , augment , escalation , growth , hike , jump , multiplication , proliferation , raise , rise , swell , upsurge , upswing , upturn