asymmetry

noun
1
the quality of having two sides or parts that are not the same in size or shape; something that creates this quality
عدم تقارن, نامتقارن, بی‌تناسبی, ناموزونی, غیر قرینه
opposite symmetry
2
the situation of not being equal or the same; something that causes this situation
ناقرینگی, ناهمسانی, عدم تقارن, نامتقارنی
the power asymmetry between the two countries