2D Shapes Definition. '2D' stands for 2-dimensional. A 2D shape is any shape that has two dimensions. Think about what it means to have two dimensions for a moment. If we had only one dimension to work with, we could only move backwards or forwards in a line. A line is one-dimensional.
Learner's definition of ACCLIMATE. US. : to adjust or adapt to a new climate, place, or situation â usually + to. [no object] He was never really able to acclimate to the hot weather. [=to get used to the hot weather] The mountain climbers spent a few days acclimating [=becoming adjusted] to the high altitude.
Sublimation (phase transition) Sublimation is the phase transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Sublimation is an endothermic process that occurs at temperatures and pressures below a substance's triple point in its phase diagram.