This is the 14801st most frequent Russian word.
плоскость
Plane; flat surface.
'Плоскость' in this context refers to a two-dimensional plane in mathematical terms.
В математике плоскость часто описывают уравнением.
In mathematics, a plane is often described by an equation.
In this sentence, 'плоскость' is used metaphorically to denote a realm or dimension of thought or analysis.
Мы обсуждаем проблему в другой плоскости.
We are discussing the problem in another dimension.
Here, 'плоскость' refers to a geometrical surface, emphasizing its flatness as a physical attribute.