(invariant) one, item, piece (of something countable; often untranslated in English) / (invariant) head (a single animal) / (declinable or invariant) piece (portion of something bigger or of an uncountable mass)

piece by piece, bit by bit

in one piece; not divided into smaller parts; (colloquial) without pauses; back-to-back; in one go / in one piece; not divided into smaller parts; (colloquial) uninjured, unhurt; in one piece

genitive singular of Stück

genitive singular of Stück

nominative/accusative/genitive plural of Stück / dative singular of Stück

patchwork

dative plural of Stück

quantity (number of items)

plural of Stückzahl