An abbreviated form
acronym, initialism, contraction, abridgment, shortening, sketch, précis, brief, abstract, curtailment, reduction,
abstraction, condensation, outline,
summary, elision, short form, clipped form, clipping, abbreviated version; see also abridgment 2, summary.
Antonyms expansion, enlargement, full form.
The act of abbreviating
reducing, shortening, truncating, reduction, contraction, condensing, abridgment, cutting, clipping, cutting out, cutting down, restriction, constriction, removing, taking out, truncation, editing, censoring, reshaping, pruning, lopping off, paring down, trimming, retrenchment, compression, foreshortening, telescoping, apocope, syncope, elision.
Antonyms addition*, augmenting, expanding.