IPA: /ˌrɛkˈtæŋɡjʊˌlærɪti/
KK: /rɛkˈtæŋɡjʊˌlærɪti/
The quality or state of having the shape of a rectangle.
The rectangularity of the table made it easy to fit into the corner of the room.
Rectangularity → It is formed from "rectangulus" (from Latin, meaning right angle) and the suffix "-ity" (meaning the state or quality of). The word "rectangularity" refers to the quality or state of being rectangular, characterized by right angles.
Think of 'right angle' ('rectangulus') to remember that 'rectangularity' means the quality of having right angles.