
ein andermal
another time
Refers to an unspecified point in the future; not now, but later.
Ich habe jetzt keine Zeit, lass uns das ein andermal besprechen.
I don't have time right now; let's discuss that another time.
another time
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another time
Refers to an unspecified point in the future; not now, but later.
Ich habe jetzt keine Zeit, lass uns das ein andermal besprechen.
I don't have time right now; let's discuss that another time.
This adverb is almost always used in the fixed expression 'ein andermal' (another time). It means 'at another, later point in time.'
Können wir das vielleicht ein andermal machen? Ich bin gerade sehr beschäftigt.
Can we maybe do that another time? I'm very busy right now.
The word is made up of 'ander' (other) and 'Mal' (time/occasion, in the sense of a point in time). Literally, 'ein andermal' means 'another time.'
Heute schaffe ich es nicht mehr, aber wir können uns gern ein andermal treffen.
I can't manage it today anymore, but we can gladly meet another time.
As a time expression, 'ein andermal' (another time) can stand flexibly in a sentence, often at the beginning for emphasis or after the verb in the middle field.
Ein andermal erzähle ich dir die ganze Geschichte.
Another time, I'll tell you the whole story.
sometime / someday
Irgendwann and andermal both refer to an unspecified point in the future. Irgendwann leaves open when something will happen, while andermal usually means not now, but on another occasion. Use irgendwann for any later point in time and andermal especially when postponing a plan.

Heute schaffe ich den Besuch nicht, aber ich komme andermal vorbei.
I can’t manage the visit today, but I’ll come by another time.
Irgendwann besuche ich dich in deiner neuen Wohnung.
Someday I’ll visit you in your new apartment.