The act of contracting
dwindling, shrinking, receding, withdrawing, shriveling, lessening, recession, withdrawal, consumption, condensation, condensing, elision, omission, deflation, evaporation, constriction, abbreviation, abbreviating, decrease, shortening, abridging, compression, narrowing, confinement, curtailment, omitting, deflating, evaporating, decreasing, abridgment, reducing, reduction, shrinkage, curtailing, diminishing, cutting down, drawing together, constricting, squeezing, flexing, tensing, consolidating, consolidation, diminution, lowering, lopping, epitomizing, editing; see also abbreviation 2, reduction 1.
Antonyms expansion, increase*, extension.