adjective
individual, single
A2
Einzeln: means 'individual' or 'single', used to describe one item or person separate from others. It’s a gradable adjective (comparative einzelner, superlative am einzelsten). Not reflexive; no special prepositions. Antonym: gemeinsam. Can also mean 'separate' in contexts. Often used attributively or predicatively.
Examples
Er nahm nur ein einzelnes Stück Kuchen.
He took just a single piece of cake.
Die Teile wurden einzeln geprüft, obwohl das Team wenig Zeit hatte, damit keine Fehler übersehen wurden.
The parts were checked individually, although the team had little time, so that no mistakes would be overlooked.
Jeder Schüler erhielt ein einzelnes Blatt Papier.
Each student received an individual sheet of paper.
Details
Mnemonics
visualize one person standing apart from a crowd — that is 'einzeln'
sounds like 'in zell' — imagine a single cell representing one unit
Notes
Can be used attributively and predicatively. Emphasizes separateness.