noun
male specialist, expert
B1
Fachmann means 'male specialist' or 'expert'. It's a masculine noun (der) with plural Fachmänner (umlaut and -er). Forms include genitive des Fachmanns and dative dem Fachmann. Female counterpart: Fachfrau (plural Fachfrauen). Common in professional contexts; plural shows vowel change in German.
Examples
Ein Fachmann hat die Heizung installiert.
A specialist installed the heating.
Die Firma beauftragte einen Fachmann, weil die Maschine ständig ausfiel.
The company hired a specialist because the machine kept failing.
Als erfahrener Fachmann gibt er oft Ratschläge an junge Kollegen.
As an experienced expert, he often gives advice to younger colleagues.
Details
Mnemonics
Picture a knowledgeable man in a workshop demonstrating a technique.
Fach -> 'fact' (knowledge), mann -> man.
Der Fachmann — 'Mann' indicates masculine, so use der.
Notes
Fachmann is the masculine counterpart to Fachfrau. Plural is Fachmänner (note the umlaut).