noun
teacher
A1
Lehrer means 'teacher', typically a male teacher; feminine is 'Lehrerin'. It's a masculine noun (der Lehrer). The plural is unchanged: die Lehrer (no umlaut). Genitive singular is des Lehrers. Regular declension patterns apply; used for school teachers and instructors in general.
Examples
Die Schule kritisierte den Lehrer, weil er die Klasse zu streng beurteilte.
The school criticized the teacher because he judged the class too strictly.
Der Lehrer erklärt die Aufgabe.
The teacher explains the exercise.
Ich bin Lehrer.
I am a teacher.
Details
Mnemonics
Imagine a male teacher at a blackboard.
Masculine 'der' — think 'der Lehrer' (male teacher).
Notes
Can be used for male teacher; 'Lehrerin' refers to a female teacher. Plural often 'Lehrer' (or 'Lehrerinnen' mixed).