the act of augmenting; state of being augmented.

that by which anything is augmented.

Music . modification of a theme by increasing the time value of all its notes.

Heraldry . an addition to a coat of arms granted to a person by a sovereign power in recognition of a notable action.

noun

decrease , degradation

noun

accession , accretion , addition , amplification , beefing up , boost , buildup , development , enhancement , enlargement , enrichment , expansion , extension , fleshing out , growth , heightening , hike , increase , increment , inflation , intensification , magnification , multiplication , raise , reinforcement , rise , strengthening , swelling , up , upping , aggrandizement , augment , escalation , jump , proliferation , swell , upsurge , upswing , upturn , acquisition