alliierter
allied
Connected with other states or groups through an alliance, especially a military alliance.
Ein alliierter Offizier koordinierte den gemeinsamen Angriff.
An allied officer coordinated the joint attack.

allied
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allied
Connected with other states or groups through an alliance, especially a military alliance.
Ein alliierter Offizier koordinierte den gemeinsamen Angriff.
An allied officer coordinated the joint attack.

The adjective 'alliierter' (allied) belongs to the word family of 'die Allianz' (the alliance). A person or state in an alliance is an 'Alliierter' (ally).
Die beiden Länder schlossen eine militärische Allianz.
The two countries formed a military alliance.
Very often, this word is used as a noun: 'die Alliierten' (the Allies). This usually refers to the allied powers that fought against Germany and its partners in World War II.
Nach dem Krieg wurde Deutschland von den Alliierten in vier Zonen aufgeteilt.
After the war, Germany was divided into four zones by the Allies.
The word is used almost exclusively in military, political, or historical contexts. Typical combinations are 'alliierte Truppen' (allied troops), 'alliierte Streitkräfte' (allied armed forces), or 'alliierte Mächte' (allied powers).
Die alliierten Truppen landeten in der Normandie.
The allied troops landed in Normandy.
neutral
'neutral' and 'alliierter' are clear opposites in disputes, wars, or political conflicts. 'neutral' means that you do not support either side. 'alliierter' means that a state or group is connected with others through an alliance and therefore belongs to one side. Learners may confuse the words because both often appear in political or historical texts. The simple guide is: someone who is neutral stays out of it. Someone who is allied is joined with others in an alliance.

Ein alliierter Staat half den anderen Ländern mit Soldaten und Material.
An allied state helped the other countries with soldiers and equipment.
Die Schweiz blieb in diesem Konflikt neutral und unterstützte keine Seite.
Switzerland remained neutral in this conflict and did not support either side.