der Major
major
A military rank for officers, generally positioned above captain and below lieutenant colonel.
Der Major gab seiner Kompanie den Befehl zum Antreten.
The major gave his company the order to fall in.

major
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major
A military rank for officers, generally positioned above captain and below lieutenant colonel.
Der Major gab seiner Kompanie den Befehl zum Antreten.
The major gave his company the order to fall in.

'Der Major' in German refers exclusively to a military rank. It is not used like the English word 'major' as an adjective meaning 'important' or for a university major.
Der Major inspizierte die Truppen.
The major inspected the troops.
When addressing a person with this rank directly and formally, the correct form of address is 'Herr Major' (Major).
Herr Major, die Soldaten sind bereit.
Major, the soldiers are ready.
The word 'Major' (major) is also a component of higher ranks, for example 'Generalmajor' (major general). This shows its position in the military hierarchy.
Er wurde zum Generalmajor befördert.
He was promoted to major general.
captain
'der Major' and 'der Hauptmann' are both military ranks for officers. They can be confused because both belong to the same rank group and are used in a military context. The difference is in the hierarchy: a Hauptmann ranks below a Major. So the Major is the higher rank. When talking about an exact military position, this difference is important.

Der Major bespricht den Einsatz mit den anderen Offizieren.
The major discusses the operation with the other officers.
Der Hauptmann führt die Kompanie während der Übung.
The captain leads the company during the exercise.