A person who is fully developed physically and mentally and is no longer a child or teenager; a person of legal age.
example
Als Erwachsener muss man für seine Entscheidungen selbst die Verantwortung übernehmen.
As an adult, you have to take responsibility for your own decisions.
Usage tips
Nominalized adjective
'Erwachsener' (adult) is a nominalized adjective from 'erwachsen' (grown-up/adult). That is why it is declined like an adjective. Pay attention to the endings depending on the article and case.
EXAMPLE
Ein Erwachsener zahlt den vollen Preis.
An adult pays the full price.
Word family
The word is derived from the verb 'wachsen' (to grow). The prefix 'er-' often describes reaching a result or final state. So an 'Erwachsener' (adult) is someone who has 'finished growing.'
EXAMPLE
Aus dem kleinen Jungen ist ein verantwortungsvoller Erwachsener geworden.
The little boy has become a responsible adult.
Masculine and feminine form
Since the word is treated like an adjective, there are different forms for male and female people. The masculine form is 'der Erwachsene' (the male adult), and the feminine form is 'die Erwachsene' (the female adult).
EXAMPLE
Der Erwachsene bestellte einen Kaffee.
The adult ordered a coffee.
Compare with
antonym
Erwachsene vs Kind
child
'Kind' and 'Erwachsene' are opposites here. A 'Kind' is a young person who is not yet an adult. An 'Erwachsener' or an 'Erwachsene' is a person who is no longer a child or teenager. So the difference is mainly about age and stage of life. In rules, prices, or conversations about responsibility, people often distinguish between children and adults.
Erwachsene
Wegen des Wetters sind nur wenige Erwachsene zum Treffen gekommen.
Because of the weather, only a few adults came to the meeting.
Kind
Im Museum kostet der Eintritt für ein Kind weniger als für Erwachsene.
At the museum, admission for a child costs less than for adults.