is a specific kind of: change of magnitude.

is a broader term that covers: addition | advance, rise | appreciation | surge, upsurge | augmentation | amplification | enlargement, expansion | escalation | maximation, maximisation, maximization | exaggeration | expanding upon, expansion | accrual, accruement, accumulation | inclusion | aggrandisement, aggrandizement, elevation | strengthening | intensification | intensification | split, split up, stock split ... show more.

is the opposite of: decrease, diminution, reduction, step-down.

derivation: increase | increase | escalate, intensify, step up.