This is the 671st most frequent German word.
allein
"Alone" or "by oneself."
Here, 'allein' is used as an adjective meaning 'alone,' describing the state of the subject.
Ich bin heute Abend allein zu Hause.
I am home alone this evening.
In this sentence, 'allein' is used as an adverb meaning 'only' or 'solely,' emphasizing the exclusivity of the method described.
Allein durch Übung wird man besser.
One improves only through practice.
Here, 'allein' conveys the feeling of being lonely or isolated, reflecting the subject's emotional state.