
anerkennen
to recognize
To accept something as valid, legitimate, or official.
Der ausländische Berufsabschluss wurde in Deutschland nicht anerkannt.
The foreign professional qualification was not recognized in Germany.
to recognize / acknowledge
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to recognize
To accept something as valid, legitimate, or official.
Der ausländische Berufsabschluss wurde in Deutschland nicht anerkannt.
The foreign professional qualification was not recognized in Germany.

to acknowledge
To honor the achievement, value, or quality of someone or something through praise or respect.
Ich möchte deine harte Arbeit und dein Engagement ausdrücklich anerkennen.
I would like to explicitly acknowledge your hard work and commitment.

to acknowledge
To admit or concede the truth or existence of something, often reluctantly.
Nach langer Diskussion musste er anerkennen, dass er im Unrecht war.
After a long discussion, he had to acknowledge that he was in the wrong.
'Anerkennen' is a separable verb. The prefix 'an-' separates in a main clause and goes to the end. In subordinate clauses and with modal verbs, the verb stays together.
Die Firma erkennt seine Leistung an.
The company acknowledges his achievement.
The verb consists of the prefix 'an-' and the verb 'erkennen' (to recognize, to identify). While 'erkennen' only means 'to perceive' or 'to identify', 'an-' adds the component of acceptance or confirmation.
Ich erkenne dich auf dem Foto kaum wieder.
I can hardly recognize you in the photo.
In official or legal contexts, 'anerkennen' (to recognize) is often used with nouns such as 'Abschluss' (degree/qualification), 'Zertifikat' (certificate), 'Status' (status), or 'Vaterschaft' (paternity).
Er kämpft darum, dass sein Diplom in Europa anerkannt wird.
He is fighting to have his diploma recognized in Europe.
When it is about appreciation, 'anerkennen' (to acknowledge) is often combined with abstract nouns such as 'Leistung' (achievement), 'Arbeit' (work), 'Mühe' (effort), or 'Verdienste' (merits).
Die Chefin hat die gute Arbeit des Teams ausdrücklich anerkannt.
The boss explicitly acknowledged the team's good work.
In the meaning of 'zugeben' (to admit), 'anerkennen' (to acknowledge) is often followed by a subordinate clause with 'dass' (that) or an infinitive construction with 'zu' (to). This expresses exactly what one admits.
Er musste anerkennen, dass sein Plan nicht funktioniert hatte.
He had to acknowledge that his plan had not worked.
to recognize / realize
Both words work when you understand the truth of an objection. erkennen initially refers to the mental insight, while anerkennen additionally expresses that you accept this truth or validity. Use erkennen for understanding and anerkennen when you explicitly admit the insight.

Nach der Erklärung erkannte ich an, dass der Einwand berechtigt war.
After the explanation, I acknowledged that the objection was justified.
Nach der Erklärung erkannte ich, dass der Einwand berechtigt war.
After the explanation, I realized that the objection was justified.